Chroom-6 in houtrook:

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vuurkorf
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Lid geworden op: 04-09-2015 22:42

Chroom-6 in houtrook:

Bericht door vuurkorf » 15-02-2017 20:33

Uit dit artikel: http://www.industrial-newsroom.com/news ... omponents/

Although Cr VI is not intentionally added during the tanning process, it may be generated in situ in leather through the oxidation of Cr III compounds, which are added to crosslink collagen subunits in the raw hide. To minimize the risk, proper tanning recipes and processes should be planned ahead, and the necessary amount of antioxidant auxiliaries such as magnesium chloride also should be considered and used. Proper pH control should be applied in neutralization steps in tanning in order to control the formation of Cr VI.

Besides in the manufacturing process, formation of Cr VI from Cr III in leather has been reported during shipment and storage. Temperature and humidity must be well controlled during the manufacturing process, shipment and storage, as high temperature and low humidity favor chromium VI formation. Besides Cr VI, the use of PCP and other chlorophenols should be of concern as they are sometimes used as preservatives and biocides for leather.

dus....Temperatuur en PH én Humidity (vochtigheid) hebben invloed op de omzetting van chroom3 weer naar 6!

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