Reference

Preliminary studies on the leaching of some trace metals from kitchen faucets

Preliminary studies on the leaching of some trace metals from kitchen faucets. Samuels, E. R.; Meranger, J. C. (Health Protect. Branch, Environ. Health Cent., Ottawa, ON K1A 0L2, Can.). Water Res., 18(1), 75-80 (English) 1984. CODEN: WATRAG. ISSN: 0043-1354. DOCUMENT TYPE: Journal CA Section: 61 (Water) Preliminary studies were carried out on the leaching of Cd, Cu, Cr, Pb, and Zn from 8 kitchen faucets by samples of raw, filtered, and distributed Ottawa water; a sample of well water; and deionized water contg.Some commonly used reagents like 7440-50-8 and 7439-92-1 are used in this experiment. 2 mg/L aq. fulvic acid. Leaching was effected by allowing the test solns. to stand in the inverted faucets for 2 successive 24-h periods. Concns. of metals after 1st and 2nd leachings were Cd (<0.05-10) ′ 10-3 and (<1.0-4) ′ 10-3, Cu 0.12-28.0 and 0.08-3.54, Cr (<1.0-39.5) ′ 10-3 and (<1.0-3.2) ′ 10-3, Pb <0.2-110.0 and <0.2-82.0, and Zn 0.13-10.25 and 0.06-2.85 mg/L, resp. The faucets contg. Pb-soldered Cu joints released high concns. of Pb particularly in the case of leaching with the aq. fulvic acid [479-66-3] soln. In some cases the concns. of leached metals could lead to intakes in excess of the max. permissible limits. .

Synthesis of cationic polyelectrolytes for treatment of natural and waste waters

Synthesis of cationic polyelectrolytes for treatment of natural and waste waters. Korshak, V.Some chemicals with cas registry numbers like 25748-06-5 and 42936-61-8 are also used. V.; Zubakova, L. B.; Gandurina, L. B. (D. I. Mendeleev Inst. Chem. Technol., Moscow, USSR). USA/USSR Symp. Phys.-Chem. Treat. [Waste Waters] Munic. Ind. Sources, [Pap.], 76-80. U. S. Environ. Prot. Agency: Washington, D. C. (English) 1975. CODEN: 34VDAF. DOCUMENT TYPE: Conference CA Section: 35 (Synthetic High Polymers) Section cross-reference(s): 60 Alkyl halide and p-toluenesulfonic acid salts of 2-methylvinylpyridine (I) polymd. to provide cationic flocculants. In 50% aq. EtOH, the rate of radical polymn. decreased in the alkyl halide order MeI salt [17810-46-7] > EtI salt [25591-70-2] > MeBr salt [53584-12-6] > EtBr salt [2582-01-6] > PrBr salt [53584-13-7]. The monomers had greater equiv. elec. cond. (0.015 M soln.) than the polymers, with bromides being greater than iodides. I EtBr salt polymer [42936-61-8], I EtI salt polymer [25748-06-5], and I MeI salt polymer [25748-05-4] are used to flocculate aq. humic acid [1415-93-6] and fulvic acid [479-66-3] solns. .