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Chromium in Postmortem Material

  • Danuta Dudek-Adamska
  • Teresa Lech
  • Tomasz Konopka
  • Paweł Kościelniak
Open Access
Article
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Abstract

Recently, considerable attention has been paid to the negative effects caused by the presence and constant increase in concentration of heavy metals in the environment, as well as to the determination of their content in human biological samples. In this paper, the concentration of chromium in samples of blood and internal organs collected at autopsy from 21 female and 39 male non-occupationally exposed subjects is presented. Elemental analysis was carried out by an electrothermal atomic absorption spectrometer after microwave-assisted acid digestion. Reference ranges of chromium in the blood, brain, stomach, liver, kidneys, lungs, and heart (wet weight) in the population of Southern Poland were found to be 0.11–16.4 ng/mL, 4.7–136 ng/g, 6.1–76.4 ng/g, 11–506 ng/g, 2.9–298 ng/g, 13–798 ng/g, and 3.6–320 ng/g, respectively.

Keywords

Chromium concentration Blood Human organs ETAAS 

Introduction

Chromium (Cr) is one of the heavy metals that is important for humans [1]. It is present in air, water, soil, and any living matter from natural and anthropogenic sources, with the largest release occurring from industrial (metallurgical, refractory, and chemical) sources.

The leading consumer of chromium materials, with ferrochromiums as the main components, is the stainless steel industry. In the refractory industry, chromium is mainly used in linings for high temperature industrial furnaces, while in the chemical industry, it is used primarily in pigments. Other applications include metal finishing, leather tanning, wood preservatives, catalysts, and miscellaneous applications, such as drilling mud, chemical manufacturing, textiles, toners for copying machines, magnetic tapes, and dietary supplements (for example chromium picolinate) [2, 3]. What is more, chromium alloys are also used in metal joint prostheses [2, 4, 5].

However, the general population is primarily exposed to this element by ingesting food [6]. Other routes of exposure like inhalation of ambient air, drinking water, or skin contact with certain consumer products or soils that contain chromium are of rather minor importance [2]. Chromium-rich food includes entrails, meat, mollusks, lobsters, vegetables, bran, whole wheat or rye bread, and unrefined sugar [1, 3].

The estimated safe daily dose of Cr(III) is 50 to 200 μg [3], while an adequate intake determined by the Institute of Medicine (IOM) of the National Research Council (NRC, USA) is 20–45 μg Cr(III)/day for adolescents and adults [2].

After ingestion, Cr(III) is absorbed mainly in the small intestine, then transported through blood to the cells and relatively quickly absorbed by bones, also accumulating in the spleen, liver, and kidneys [7]. The IOM reported average total plasma chromium concentrations of 0.10–0.16 μg/L and an average urinary chromium excretion of 0.22 μg/L or 0.2 μg/day [2].

Despite the growing interest in speciation analysis of different biologically important chromium forms—Cr(III), which is recognized as a trace element and Cr(VI), which is considered to be toxic, mutagenic, and carcinogenic—determination of its total content in available biological materials (such as body fluids and tissues) is still of great importance to clinical and forensic toxicology. This is because the knowledge of total content allows us to determine so-called “reference values/ranges” (for non-exposed and non-poisoned people), which can later be used for comparative purposes (confirmation or exclusion of any metal compound poisoning), for exposure assessment (e.g., environmental or occupational), as well as in the diagnosis of certain medical conditions. It is considered that chromium in the lungs is a result of deposition from inhaled air, whereas chromium in food is the main source in other organs [6]. For example, Antilla et al. [8] found that the average lung tissue concentration of total chromium in smokers was 6.4 μg/g versus 2.2 μg/g in non-smokers. Concentrations of total chromium in biological material in fatal cases of poisonings with chromium compounds are significantly higher (stomach 6–34 μg/g, liver 42–320 μg/g, kidneys 33–220 μg/g, blood 11 μg/mL, urine 18–101 μg/mL) [9].

However, current data on the concentration of total chromium in the human body in non-exposed people are mostly limited to concentrations found in whole blood [10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23], serum [11, 12, 13, 16, 24, 25], urine [11, 13, 14, 15, 17, 19, 20, 22, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34], or hair [17, 19, 20, 35, 36, 37, 38] from living subjects, as these are the most easily available samples. If there is any information on chromium determination in tissues and organs, it comes rather from earlier publications [36, 39, 40, 41, 42, 43, 44]; one of the newest was written in 2010 by Goullé et al. [45]. That is why, in this study, an evaluation of total chromium content in the internal organs and blood of non-exposed and non-poisoned subjects from Southern Poland was carried out.

Material and Methods

Reagents and Instrumentation

Analytical grade reagents from Merck (Darmstadt, Germany) and deionized water (NANOpure Diamond, Barnstead, Dubuque, IA) were used in the analysis. Glass and polypropylene vessels were soaked for 24 h in 5% (v/v) nitric acid solution and rinsed before use with deionized water.

An Ethos 1 microwave digestion system (Milestone, Sorisole, Italy) equipped with Teflon high-pressure reaction vessels was used for the wet digestion of samples of investigated materials.

The determination of total chromium was performed by an electrothermal atomic absorption spectrometer (Solaar MQZe, Thermo Electron, Waltham, MA), with Zeeman background correction, at a wavelength of 357.9 nm (slit width of 0.7 nm), according to a previously optimized and validated four-step procedure [46]. The measured volume of the sample solution was 20 μL.

Material and Sample Preparation

The study was carried out on 60 autopsy cases performed routinely in the Department of Forensic Medicine of the Jagiellonian University Medical College in Kraków, after approval by the Bioethics Committee of the Jagiellonian University (reference number: KBET/102/B/2009). Biological material undergoing testing was taken from the deceased not environmentally and occupationally exposed to elevated levels of chromium after visual assessment by a forensic medical examiner. Sections of internal organs (weighing about 50–100 g) were removed with stainless steel scalpels, put into acid pre-washed polypropylene vials, and frozen at − 20 °C until analysis. Before the digestion procedure, the samples were partially thawed, and thick sections of the surrounding surface tissue, which could have been contaminated by dust and/or stainless steel material at an earlier stage, were cut off using an acid pre-washed plastic knife (similarly to the procedure described by Rahil-Khazen et al. [42]). Then the whole sample was homogenized, and approximately 1.5 mL of blood and 1.5 g of internal organs was subjected to digestion: samples of biological material were wet digested with nitric acid and hydrogen peroxide in a 5:1 volume ratio in a microwave system. A total of 414 samples of postmortem blood and sections of macroscopically normal internal organs (brain, stomach, liver, kidneys, heart, and lungs) obtained from 21 women and 39 men, aged 29–89 (56 ± 18) years and 24–88 (47 ± 13) years, respectively, were analyzed.

The determination of chromium was performed on two parallel samples of one kind of biological material (taken from one deceased person)—giving a total number of 828 analyzed samples. Each analytical result was calculated as the average of the two values determined for a pair of samples (for a single sample, chromium concentration was measured in triplicate). Values of chromium concentrations found in blood and internal organs are presented in Table 1.
Table 1

Chromium concentration in blood and internal organs (number of samples, mean ± SD, median, range) in non-exposed population of Southern Poland [ng/g wet weight or ng/mL]—gender approach

Material

Group

n

Mean ± SD

Median

Range*

Blood

Female

19

4.51 ± 3.53

4.33

0.11

11.4

Male

37

4.67 ± 4.28

3.74

0.11

16.4

Total

56

4.62 ± 4.01

3.85

0.11

16.4

Brain

Female

19

56.3 ± 53.3

39.5

4.8

197

Male

36

34.3 ± 23.2

26.8

4.7

95.9

Total

55

40.8 ± 33.4

29.6

4.7

136

Stomach

Female

19

92.0 ± 88.3

44.7

6.1

313

Male

35

31.8 ± 16.4

27.7

11.6

76.4

Total

47

32.6 ± 16.7

28.3

6.1

76.4

Liver

Female

19

136 ± 81

123

23

334

Male

37

290 ± 367

162

11

1381

Total

52

156 ± 124

122

11

506

Kidney

Female

17

50.1 ± 21.0

52.9

19.8

82.3

Male

37

106 ± 92

68.5

2.9

371

Total

54

85.2 ± 73.4

60.6

2.9

298

Lung

Female

19

362 ± 338

285

44

1204

Male

32

271 ± 181

211

13

716

Total

49

271 ± 189

207

13

798

Heart

Female

21

103 ± 104

59.2

3.6

366

Male

37

84.5 ± 58.2

77.0

6.9

318

Total

58

90.5 ± 74.9

70.4

3.6

320

*Minimum and maximum values obtained (after the removal of the outliers identified by the Grubb’s test) among different group analyzed (female, male, total)

Statistical Analysis

The material undergoing testing was taken from individuals without any visible pathological changes in their bodies. However, during the study, in some samples of certain materials, chromium content was found to be extremely high in comparison to the mean value established for the whole group. Using Grubbs’ test for outliers, all these extreme results, possibly related to health, nutrition, or smoking habits (data to which we unfortunately did not have access), were rejected before statistical evaluation of the obtained data.

During statistical examination, Statistica 5.0 software was used. The Mann-Whitney U Test and ANOVA Kruskal-Wallis Test were applied to assess the relationship between chromium content in postmortem material and gender or age—the box and whisker plots are presented in Figs. 1 and 2.
Fig. 1

Chromium content in blood and internal organs [ng/mL or ng/g] of non-exposed population of Southern Poland: the Mann-Whitney U Test’s box and whisker plots drawn for gender

Fig. 2

Chromium content in blood and internal organs [ng/mL or ng/g] of non-exposed population of Southern Poland: ANOVA Kruskal-Wallis Test’s box and whisker plots drawn for age-groups

Results and Discussion

In the analyses of body tissues, the highest chromium concentrations were determined in cumulative organs, such as the lungs and liver, in the ranges of 13.4–798 and 11–506 ng/g, respectively. The lowest chromium content was obtained for the stomach and brain, where the total averages did not exceed 50 ng/g. What is more, in 15 blood samples, the concentration of chromium was below the limit of quantification (LOQ, 0.22 ng/mL). For these samples, the results were replaced by a value of half the LOQ, when calculating the approximate mean chromium content.

Using the Mann-Whitney U Test, a statistically significant relationship between gender and chromium content (Table 1) was only revealed in the stomach (p = 0.006). It may be associated with different diets consumed by these two groups, as it is generally accepted that men eat more meat and bread (rich in chromium), while women consume more fruit, vegetables, and dairy products (with less chromium content) [3, 47, 48, 49].

As one can find in available literature, with the exception of the lungs, the concentration of chromium in all other organs decreases with age [6]. However in our study, such tendency could be seen only in blood samples; in other tissues, there was more or less visible increase in chromium content. What is more, when considering heart tissue, median values of chromium concentration obtained during the course of this study were practically on one level (between 50 and 80 ng/g) in all age groups, as well as in kidney tissue (close to 70 ng/g, apart from the group between 31 and 40 years where the value was about two times greater). ANOVA Kruskal-Wallis Test was used to assess whether there was a possible relationship between age and chromium concentration in particular tissue (Table 2). A statistically significant differences were again revealed only in the stomach samples (p = 0.01).
Table 2

Chromium concentration in blood and internal organs (number of samples, mean ± SD, median, range) in non-exposed population of Southern Poland [ng/g wet weight or ng/mL]—age-group approach

Material

Age-group

n

Mean ± SD

Median

Range*

Blood

< 30

8

7.08 ± 3.41

7.58

0.11

12.9

31–40

10

5.85 ± 4.37

5.85

0.11

13.6

41–50

14

3.95 ± 2.35

3.89

0.11

7.71

51–60

11

3.35 ± 3.87

1.96

0.11

10.6

> 60

12

4.40 ± 3.63

3.54

0.11

11.4

Brain

< 30

6

18.2 ± 11.0

12.6

6.1

30.3

31–40

9

57.2 ± 53.3

31.1

18.9

162

41–50

17

37.7 ± 20.5

36.5

4.7

79.4

51–60

11

45.4 ± 25.9

45.2

8.8

89.3

> 60

12

59.7 ± 58.7

43.7

7.5

197

Stomach

< 30

7

87.2 ± 61.0

64.8

32.1

181

31–40

9

25.4 ± 9.2

24.4

11.6

38.9

41–50

15

27.0 ± 11.3

28.3

6.1

45.2

51–60

10

39.2 ± 20.1

34.4

18.1

76.4

> 60

13

93.0 ± 93.4

44.7

13.3

313

Liver

< 30

8

227 ± 162

219

10.9

488

31–40

9

289 ± 403

93

54.8

1094

41–50

18

177 ± 153

130

15.8

506

51–60

8

199 ± 99

193

58.6

334

> 60

13

317 ± 434

178

43.4

1381

Kidney

< 30

7

61.2 ± 22.5

66.0

21.1

86.2

31–40

10

149 ± 121

131

24.9

371

41–50

18

78.7 ± 60.4

55.3

20.4

218

51–60

10

97.0 ± 73.1

68.5

19.8

257

> 60

10

90.9 ± 87.4

69.6

2.9

256

Lung

< 30

8

267 ± 233

173

13.4

610

31–40

8

223 ± 152

175

65.2

519

41–50

15

427 ± 488

207

43.9

1424

51–60

9

301 ± 153

367

75.2

501

> 60

13

407 ± 297

393

83.0

1066

Heart

< 30

7

71.9 ± 45.6

59.2

6.89

130

31–40

9

80.2 ± 31.9

77.0

35.4

133

41–50

16

75.0 ± 48.8

61.6

3.63

183

51–60

10

82.0 ± 48.7

83.2

18.5

166

> 60

13

84.7 ± 90.9

49.4

8.64

289

*Minimum and maximum values obtained (after the removal of the outliers identified by the Grubb’s test) among different group analyzed (female, male, total)

In Tables 3 and 4, levels of chromium in blood and internal organs determined by different authors are given.
Table 3

Reference values of chromium in blood (number of samples, mean ± SD, range) found by various authors [ng/mL]

Group

n

Mean ± SD

Median

Range

Country

Reference

Male and female

23

0.18 ± 0.10

   

Denmark

[12]

Male and female

134

0.19

 

0.10

0.60

UK

[15]

Male and female

519

0.23 ± 0,01

 

0.09

0.75

Italy

[11]

Adolescents

200

0.25c

 

0.23b

0.27b

Belgium

[22]

Male and female

110

0.44 ± 0.27

0.38

0.12

1.07

Italy

[16]

Male and female

90

1.07 ± 0.68a

0.96a

0.04a

2.37a

Pakistan

[23]

School children

49

1.25 ± 0.74

1.10

0.40

4.63

South Africa

[18]

Male and female

106

4.10

0.55

0.33b

0.87b

France

[21]

Male and female

75

75.3 ± 7.6

 

63.3

87.1

Pakistan

[17]

Male

46–60 years

43

60.5 ± 3.2

61.3

58.1

63.8

Pakistan

[19]

Male

62–75 years

37

58.9 ± 2.6

58.4

55.2

61.1

Pakistan

[19]

Female

46–60 years

47

59.2 ± 2.9

59.1

57.1

63.5

Pakistan

[19]

Female

61–75 years

39

54.2 ± 2.8

54.4

51.9

57.9

Pakistan

[19]

Boys

6–10 years

42

91.6 ± 8.2

 

83.9

109.3

Pakistan

[20]

Girls

6–10 years

38

86.1 ± 7.2

 

79

93.2

Pakistan

[20]

aThe conversion of g to mL has been made taking into account average density of blood—1.06 g/mL

bRange as 5–95th percentile

cGeometric mean

Table 4

Reference values of chromium in internal organs (number of samples, median, mean ± SD, range) found by various authors [ng/g]

Material

n

Mean ± SD

Median

Range

Country

Reference

Brain

22

81

84

37

120

Norway

[42]

142

170 ± 120

 

150a

190a

Korea

[43]

20

51

 

20

140

France

[45]

Liver

30

 

< 60

< 60

1800

Romania

[39]

41

100

80

40b

210b

Italy

[36]

148

330 ± 250

 

290a

370a

Korea

[43]

5–11

270 ± 280

   

Sweden

[44]

20

60

 

40

100

France

[45]

Kidney

30

< 30

< 30

120

Romania

[39]

41

60

60

30b

120b

Italy

[36]

28c

53

49

32

94

Norway

[42]

28d

50

52

21

94

Norway

[42]

139

180 ± 140

 

150a

200a

Korea

[43]

5–11

513 ± 267

   

Sweden

[44]

19

43

 

40

110

France

[45]

Lung

23

 

570

140

2190

Germany

[41]

41

770

 

70b

1490b

Italy

[36]

140

410 ± 320

 

350

460

Korea

[43]

20

< LOQ

   

France

[45]

18

61

57

41

103

Norway

[42]

Heart

140

170 ± 130

 

150

190

Korea

[43]

20

< LOQ

   

France

[45]

a95% confidence interval

bRange as 5–95th percentile

cKidney cortex

dKidney medulla

When comparing results obtained in the course of this study with data published earlier, it can be stated that mean values of chromium concentration in blood and internal organs generally fell within the range of reference concentrations established by other authors, with a few exceptions. In blood samples, values obtained in normal adults given by Afridi et al. [17] and Kazi et al. [19] as well as in children (6–10 years old) reported by Shah et al. [20]—all from Pakistan—were definitely higher than those obtained by us and Cesbron et al. (among the French population) [21]. There have been no data concerning chromium content in the stomach provided by other authors. In the analysis of liver samples, chromium content in the range of 11–506 ng/g, with an average value of 156 ng/g, determined during this study was slightly higher than reported by Caroli et al. [36] and Goullé et al. [45] for non-occupationally exposed Italian and French subjects, respectively. Both Muramatsu and Parr [39] and Rahil-Khazen et al. [42] were not able to determine chromium in this medium. Among the results for the kidneys (in the range of 2.9–298 ng/g, with an average value of 85.2 ng/g) and the brain (in the range of 4.7–136 ng/g, with an average value of 40.8 ng/g), there were some higher ones; e.g., Engström et al. [44] estimated 513 ng/g in liver biopsy tissue supplied by Le Centre de Toxicologie du Québec (Canada) and Rahil-Khazen et al. [42]—81 ng/g in brain front lobe from autopsies performed in the Gade Institute, Department of Pathology and Department of Forensic Medicine (Norway). It is worth mentioning that compared to Yoo et al. [43], mean values of chromium concentration determined in this study were lower in all investigated matrices.

As mentioned in the Introduction section, one should bear in mind that the diversity between results obtained by us and other authors may be connected with the fact that different populations were studied in which many factors (such as health, age, gender, nutrition, and living and working environment) could have influenced the amount and distribution of chromium in the body. What is more, data obtained in this study, as well as the above mentioned results provided by other authors, refer to non-occupationally exposed, healthy people. Chromium content in blood and organs may vary in different pathologies and be higher when exposure to elevated levels occurs. For example, total chromium concentration ranges in the blood of atherosclerosis patients versus healthy donors, reported by Ilyas and Shah [23] were slightly higher (140–4210 and 40–2240 ng/g, respectively), while those in the blood of diabetes mellitus patients, as presented by Kazi et al., were lower (51.9–63.8 ng/mL in control group and 39.8–50.3 ng/mL in patients). When considering occupational exposure data provided by Danadevi et al. [50], Teraoka [51] are good examples. The first authors estimated that welders had significantly higher total chromium concentrations in blood when compared with controls (151.65 versus 17.86 ng/mL). The second reported that the highest concentration of chromium, from ten to a thousand times greater than the content stated for the control group (average 1.4 mg/g, dry weight), were found in lungs of two chromium plating (220 and 1400 mg/g) and three chromate refining (40, 58, and 110 mg/g) workers. A slightly higher values were also noticed in other investigated material, e.g., the liver, heart, spleen, and kidney.

Conclusions

On the basis of the results of analyses of chromium content in postmortem material obtained from 60 people in a Southern Polish population, it can be stated that there were no significant differences (except for the stomach) between male and female subjects, as well as that obtained data were generally consistent with other published findings, when taking into consideration that many factors may influence the final results. The obtained data may constitute a contribution to population-based studies on metal content in biological material, in particular autopsy material, and may be useful in the interpretation of the results of chemo-toxicological investigations.

Notes

Funding

This research was supported by the following research projects: Nos. NN404 189136 and NN404 010339, funded by The Ministry of Science and Higher Education in Poland.

Compliance with Ethical Standards

The study received ethical clearance (KBET/102/B/2009) from the Bioethics Committee of the Jagiellonian University.

Conflict of Interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. 1.Department of Analytical ChemistryFaculty of Chemistry of the Jagiellonian UniversityKrakówPoland
  2. 2.Institute of Forensic ResearchKrakówPoland
  3. 3.Department of Forensic MedicineJagiellonian University Medical CollegeKrakówPoland

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