Abstract
Cyclic volatile methyl siloxanes (cVMS) have now become a subject of environmental contamination and risk assessment due to their widespread use and occurrence in different environmental matrices. Due to their exceptional physio-chemical properties, these compounds are diversely used for formulations of consumer products and others implying their continuous and significant release to environmental compartments. This has captured the major attention of the concerned communities on the grounds of potential health hazards to human and biota. The present study aims at comprehensively reviewing its occurrence in air, water, soil, sediments, sludge, dusts, biogas, biosolids, and biota and their environmental behavior as well. Concentrations of cVMS in indoor air and biosolids were higher; however, no significant concentrations were observed in water, soil, and sediments except for wastewaters. No threat to the aquatic organisms has been identified as their concentrations do not exceed the NOEC (maximum no observed effect concentration) thresholds. Mammalian (rodents) toxicity hazards were not very evident except for the occurrence of uterine tumors in very rare cases under long-term chronic and repeated dose exposures in laboratory conditions. Human relevancy to rodents were also not strongly enough established. Therefore, more careful examinations are required to develop stringent weight of evidences in scientific domain and ease the policy making with respect to their production and use so as to combat any environmental consequences.
Graphical Abstract
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(Source: Amec. Foster Wheeler Global Siloxane Council Survey, May 2015)
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Source: Xu et al., (2012)
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Abbreviations
- cVMS:
-
Cyclic volatile methyl siloxanes
- OECD:
-
Organisation for Economic Co-operation and Development
- USEPA:
-
United States Environmental Protection Agency
- ECHA:
-
European Chemical Agency
- GSC:
-
Global Silicone Council
- D4:
-
Octamethylcyclotetrasiloxane
- D5:
-
Decamethylcyclopentasiloxane
- D6:
-
Dodecamethylcyclohexasiloxane
- Kow :
-
Octonal-water partitioning coefficient
- Koc :
-
Organic carbon partitioning coefficient
- KAW :
-
Air-water partition coefficient
- TDS:
-
Total dissolved solids
- ECHC:
-
Environment Canada Health Canada
- USD:
-
United States Dollar
- HSDB:
-
Hazardous Substances Data Bank
- PCPs:
-
Personal care products
- AICIS:
-
Australian Industrial Chemicals Introduction Scheme
- OH°:
-
Hydroxyl radical
- kg/yr:
-
Kilogram per year
- μg/g:
-
Microgram per year
- mg/day:
-
Milligram per day
- ng/m3 :
-
Nanogram per cubic meter
- NYIEQ:
-
New York Indoor Environmental Quality Center
- ng/L:
-
Nanogram per liter
- WWTPs:
-
Wastewater treatment plants
- REACH:
-
Registration, Evaluation, Authorisation and Restriction of Chemicals European Regulation
- ng/g dw:
-
Nanogram per gram dry weight
- μg/g dw:
-
Microgram per gram dry weight
- ng/g ww:
-
Nanogram per gram wet weight
- LOD:
-
Limit of detection
- NOEC:
-
No observed effect concentration
- TE:
-
Transfer efficiency
- BeTR Model:
-
Biogeochemical transport and reactions model
- DEHM:
-
Danish Eulerian Hemispheric Model
- CMAQ Model:
-
Community Multiscale Air Quality Model
- RH:
-
Relative humidity
- BAF:
-
Bio-accumulation factor
- BCF:
-
Bio-concentration factor
- vB:
-
Very bioaccumulative
- BSAF:
-
Biota-sediment accumulation factor
- C organism tissue :
-
Concentration in organism’s tissue
- Csediment :
-
Concentration in sediment
- mg/kg:
-
Milligram per kilogram
- BMF:
-
Bio-magnification factor
- TMF:
-
Trophic magnification factor
- LRT:
-
Long range transport
- LOEC:
-
Lowest observed effective concentration
- NOEL:
-
No observable effect level
- EC:
-
Effective concentration
- LC:
-
Lethal concentration
- mg/kg bw:
-
Milligram per kilogram body weight
- IRDC:
-
International Research and Development Corporation
- SCCS:
-
Scientific Committee on Consumer Safety
- CAR:
-
Constitutive androstane receptor
- DCC:
-
Dow Corning Corporation
- ESIS:
-
European chemical Substances Information System
- LOEL:
-
Lowest observed effect level
- MOS:
-
Margin of safety
- PBPK:
-
Physiological-based pharmacokinetic modeling
- GSPA:
-
Global Silicone Producers Association
- NOEAL:
-
No observed adverse effect level
- EA:
-
European Agency
- PFOA:
-
Perfluorooctanoic acid
- PFOS:
-
Perfluorooctane sulfonate
- PBDEs:
-
Polybrominated diphenyl ethers
- PDMS:
-
Polydimethyl siloxanes
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Acknowledgements
Authors are thankful to Director, CSIR-NEERI, for allowing us to undertake this challenging work. We are also thankful to the Recycling and Environment Industry Association of India for providing financial support for this scientific work. The paper has been checked by iThenticate plagiarism checker software within the institute and has been approved to be published vide KRC No. CSIR-NEERI/KRC/2021/MAY/KZC/3.
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This work was supported by the Recycling and Environment Industry Association of India (REIAI). Dr. Kanchan Kumari has received financial support from REIAI.
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Kanchan Kumari conceptualized the work, visualized the review, critically analyzed the data, and finalized the manuscript. Anshika Singh performed the literature and data search and equally participated in preparation of the first and the final draft and performed summarization of data under the supervision of Kanchan Kumari. Deepak Marathe was equally involved in the preparation of the manuscript, and formation of tabular data and graphical representation as well.
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Kumari, K., Singh, A. & Marathe, D. Cyclic volatile methyl siloxanes (D4, D5, and D6) as the emerging pollutants in environment: environmental distribution, fate, and toxicological assessments. Environ Sci Pollut Res (2023). https://doi.org/10.1007/s11356-023-25568-7
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DOI: https://doi.org/10.1007/s11356-023-25568-7