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Which of the toxic heavy metals is found in modern tannery industries ?

Answer» <html><body><p> <a href="https://interviewquestions.tuteehub.com/tag/chromium-916213" style="font-weight:bold;" target="_blank" title="Click to know more about CHROMIUM">CHROMIUM</a><br/></p><br/><br/><p>Chromium is mainly found in waste from the <a href="https://interviewquestions.tuteehub.com/tag/chrome-419551" style="font-weight:bold;" target="_blank" title="Click to know more about CHROME">CHROME</a> tanning process; it occurs as part of the retanning system and is displaced from leathers during retanning and dyeing processes. This chrome is discharged from processes in soluble form; however, when mixed with tannery waste waters from other processes (<a href="https://interviewquestions.tuteehub.com/tag/especially-975202" style="font-weight:bold;" target="_blank" title="Click to know more about ESPECIALLY">ESPECIALLY</a> if <a href="https://interviewquestions.tuteehub.com/tag/proteins-607691" style="font-weight:bold;" target="_blank" title="Click to know more about PROTEINS">PROTEINS</a> are present), the reaction is very rapid. Precipitates are formed, mainly protein-chrome, which add to sludge generation. If chrome discharges are excessive, the chromium might remain in the solution. Even in low concentrations, it has a toxic effect upon <a href="https://interviewquestions.tuteehub.com/tag/daphnia-434436" style="font-weight:bold;" target="_blank" title="Click to know more about DAPHNIA">DAPHNIA</a>, thus disrupting the food chain for fish life and possibly inhibiting photosynthesis.</p></body></html>


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