Abstract
A new colorimetric method for the determination of hydroquinone and a procedure for the analysis of biuret in hydroquinone-containing urea are described. For hydroquinone determination, NH4Cl (pH = 10) was used as color reagent and the color intensity was measured at 360 nm with a U-VIS-spectrophotometer. The recovery of hydroquinone by this method was found to be 90–110%. Biuret in hydroquinone-urea was assayed by copper-colorimetric method but with the pre-removal of hydroquinone and its oxides with butyl acetate and a chromatography tube. The latter was installed with aluminium oxide and silica-magnesia absorbent respectively. This procedure gave a total of 88.3–93.0% recovery of biuret.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Explore related subjects
Discover the latest articles and news from researchers in related subjects, suggested using machine learning.References
Bolykin NI (1969) Colorimetric analysis of phenidone, hydroquinone, metol and p-aminodiethylaniline. Tekhnicheskie Kino Telegraphie 13, 34
Bremner JM and CS Mulvaney (1978) Urease activity in soils. In: Burns RG (ed) Soil Enzymes, pp 149–197. London: Academic Press
Cao Chenmian and Zhou Likai et al (1987) The technology of hydroquinone-containing urea fertilizer production. Chinese Patent Publication Vol 3, No 10
Ionesca-Matiu A (1939) Colorimetric microdetermination of some phenols. Journal of Pharmaceutical Chemistry 30: 49–58
Li Youkai (1983) Determination of biuret in urea. In: LI YK (ed) Methods of Soil and Agrochemistry Analysis, pp 360–361. Beijing: Academic Press
Li Ronghua, Zhou Likai and Zhao Xiaoyan (1992) Application of slow-release (hydroquinone-containing) urea in agriculture. Chinese Journal of Soil Science (in press)
Perel Shtein EI (1967) Colorimetric determination of small amounts of phenol, hydroquinone and pyrocatechol in a mixture. Gridrokhimicheskaya Materiya 43: 82–85
Rao DLN and Chai SH (1986) Urease inhibitors: effect on wheat growth in alkali soil. Soil Biology and Biochemistry 18, 255–258
Zhou Likai and Wu Guanyun (1988) Effect of urease inhibitor hydroquinone on the efficiency of urea fertilizer. Acta Pedologica 25: 191–198
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhao, X., Xie, C., Zheng, Q. et al. Determination of hydroquinone and biuret in hydroquinone-containing urea fertilizer. Fertilizer Research 33, 93–96 (1992). https://doi.org/10.1007/BF01058013
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01058013