Ferrous sulfate, hazards with

Contact dermatitis can occur from exposure to cement and has been considered an occupational hazard for construction workers (Turk and Rietschel 1993 Roto et al. 1996 Zachariae et al. 1996). The problem develops because chromium(VI)-con-taining residues from blast furnaces are incorporated into cement. Some countries add ferrous sulfate to cement to reduce the amount of soluble hexavalent chromate in the product (Turk and Rietschel 1993 Roto etal. 1996 Zachariae etal. 1996). In the UK, chromium and chromates accounted for 8.1% of the allergic contact dermatitis cases (Meyer et al. 2000). In Finland, chromium causes 5.6% of ACD, with tanners, cast concrete workers, leader goods workers, and metal plating/coating workers being at greatest risk (Kanerva et al. 2000). In Denmark, the chromium(VI) content of 35% of... 

In this procedure [3, 12, 13] a known excess of standard ceric ammonium nitrate solution is added to an azide solution or slurry. The excess ceric ammonium nitrate is titrated with standard ferrous ammonium sulfate or sodium oxalate, using ferroin as indicator. The method is extremely simple and flee from hazard once the reagents have been mixed. A serious drawback is that dextrin and polyvinyl alcohol are oxidized by ceric ion. Blay [1] reports gelatin and carboxymethyl cellulose are not oxidized. The method is as follows. 

If unpreso ed ethyl ether is used as a mobile phase constituent, it must be routinely tested for the presence of peroxides. A visual ferrous ammonium sulfate test is conducted as follows [798] SmL 1% ferrous ammonium sulfate (fi eshly prepared), O.SmL IN sulfuric acid, and 0.5mL 0.1 N ammonium thiocyanate ate mixed (and decolorized with a trace of zinc dust if necessary) and shaken with an equal quantity of the ether to be tested. If peroxides are present, a red color develops. This method is significantly more sensitive than the KI test described in Chapter 1. However, inqrroper storage can drastically increase the rate of peroxide formation and present a safety hazard to the user. This is especially true when pre- or postanalysis sanqrle concentration stq>s involve ether (e.g., extractions or preparative LC). 

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