Stabilization of chromium: An alternative to make safe leathers

Gong, Ying; Liu, Xiaoling; Huang, Li; Chen, Wuyong

doi:10.1016/j.jhazmat.2010.03.037

Cited by 47 publications

(16 citation statements)

References 5 publications

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“…Chromium is extensively used in various industrial applications like electroplating, leather tanning, refractory industry and metallurgy [1,2]. It occurs mainly in two oxidation states namely VI and III and is released in the aquatic environment at the hexavalent state either as Cr 2 O 7 2− or HCrO 4 − depending on the pH (Cr 2 O 7 2− + H 2 O → 2HCrO 4 − , pK a = 1.68).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

Gherbi

Nasrallah

Amrane

et al. 2011

Journal of Hazardous Materials

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Section: Introductionmentioning

confidence: 99%

Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

Gherbi

Nasrallah

Amrane

et al. 2011

Journal of Hazardous Materials

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“…31 The use of antioxidants and the application of 1-3% of vegetable tannin (calculated on the weight of wet-blue leather) in the retanning step are enough to ensure that the leather resists the accelerated aging process without formation of hexavalent Cr. 30,32 The influence of the following conditions on the oxidation of Cr(III) to Cr(VI) was evaluated: 30 the supply of chromium in tanning (6 or 9% of chromium salt), the effect of retanning (with chromium and with vegetable tannin), the deacidification pH and the types of fatliquoring oils (synthetic, fish and sulfited calf's foot jelly oils. Cr(VI) was analysed in samples under natural conditions and after accelerated aging.…”

Section: Tanning With Chromium Saltsmentioning

confidence: 99%

CHAPTER 16. Chromium in Tannery Wastewater

Gutterres¹,

Mella²

2014

Heavy Metals in Water

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The tanning process in Brazil, and worldwide, is of great economic importance. Brazil has the second largest herd, representing approximately 210 million heads of cattle, and has the largest marketable herd in the world. The country is also the second largest producer and exporter of leather and aims at excellence with investments, qualification and technology. 1 The global leather industry is giving increasing attention and making efforts to treat liquid effluents and provide proper disposal for the sludge and residues generated in the processes.There is great concern regarding the level of treatment and the final destination of the effluents and about what will be the consequences for the environment with regards to the quality of the receiving waters. Considering these aspects, studies, criteria and projects relating to the treatment and disposal of the effluents must proceed with special care to ensure adequate decontamination of the effluents, and, equally, the maintenance and improvement of the uses and of the quality of the receiving bodies. 2 Tanning with chromium salts is the most widely employed method; usually chromium used in leather processing is in the form of basic chromium sulfate (CrOHSO 4 ) and is analysed in the form of chromium oxide.Heavy Metals in Water: Presence, Removal and Safety Edited by Sanjay K. Sharma

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“…Leather tanning mostly involves trivalent chromium, but under certain conditions, the chromium of tanned hides can convert to the hexavalent form [16,17]. Thus, handlers of chromium tanned hides may be exposed to not only trivalent but also to hexavalent chromium.…”

Section: Introductionmentioning

confidence: 99%

Exposure to Leather Tanning Factories Lowers Semen Quality in Mongolian Men

Myagmartseren,

Geater,

Sriplung

2017

Cent. Asian j. Med. Sci.

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Objectives: To examine the difference in semen qualities of male workers in leather tanning factories and of those in other industries. Methods: Eighty reproductive aged male workers from six leather tanning factories and eighty-five from non-tanning workplaces participated in the study as the exposed subjects and non-exposed subjects, respectively. Each subject was given a physical examination, required to complete a questionnaire, and asked to supply a semen specimen. Semen analysis on fresh specimens followed the latest World Health Organization guideline. Semen parameters were compared between the exposed and non-exposed subjects using tabulation and chi-square test for categorical variables and t-test or rank-sum test for continuous variables. Multiple linear or logistic regression models were constructed to examine the independent effects of exposure. Results: After adjusting for confounding variables, exposed subjects had significantly higher percentages of grade C motility (p=0.008), mid-piece defect (p=0.009), and tail-defect (p=0.029) in their spermatozoa compared to non-exposed subjects. Liquefaction time was also longer (p=0.046). Conclusion: Leather tanning workers have significantly higher percentages of grade C motility, mid-piece defect, and tail-defect in their spermatozoa.

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Stabilization of chromium: An alternative to make safe leathers

Cited by 47 publications

References 5 publications

Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2

CHAPTER 16. Chromium in Tannery Wastewater

Exposure to Leather Tanning Factories Lowers Semen Quality in Mongolian Men

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