Spectrophotometric Study of Chromium (VI) in Shaving Dust, Waste Liquor, and Wet Blue Trimming Samples

Md. Amjad Hossain, Al-Amin Rabbi and Md. Kamrul Hasan

International Journal of Science and Business, 2020, vol. 4, issue 3, 18-27

Abstract: Humans are exposed to chromium ions from leather materials owing to everyday contact with different need based activities. The concern is that Cr (VI) is extremely toxic and may cause contact allergic dermatitis on the skin and may also be a trigger for a plethora of diseases, hence it is essential to monitor the presence of chromium as Cr (VI). For the determination of levels of chromium (VI) the shaving dust samples from four different tanneries and chrome liquor, and wet blue leather trimmings from three different tanneries were collected. The fat content was determined in collected shaving dust and wet blue trimmings with the aid of Soxhlet extraction method using petroleum ether- ethanol solvent. Then the extraction of Cr (VI) from the samples was done following the standard procedure of society for Leather Chemistry with some modification. Afterwards, UV- visible spectrophotometric determination of Cr (VI) was carried out through the complex formation with 1, 5-diphenylcarbazide (DPC). The weight percentages of fat content were found to be in the range of 2.98-3.71. Analytical grade potassium-dichromate reagent was used as a standard source of Cr (VI) in calibration process. Among the collected four shaving dust samples in three samples were found to contain Cr (VI) in the range of 1.96-2.19 mg/kg. In three analyzed wet blue trimmings samples the Cr (VI) was found to be from 1.59 to 1.86 mg/L. The amount of hexavalent chromium was found 1.27 mg/L in one chrome liquor sample out of three samples.

Keywords: Hexavalent Chromium; UV-Visible spectrophotometer; Chrome-tanning; Extraction; Shaving dust; Bioaccumulation (search for similar items in EconPapers)
Date: 2020
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