Reference

Simple and rapid preconcentration and determination of trace elements in water

Simple and rapid preconcentration and determination of trace elements in water. Determination of cadmium by anodic stripping voltammetry. Taguchi, Shigeru; Sugihara, Hidekado; Kasahara, Issei; Goto, Katsumi; Hara, Minoru (Fac. Sci., Toyama Univ., Toyama, Japan). Mizu Shori Gijutsu, 25(10), 699-703 (Japanese) 1984. CODEN: MSYGAO. ISSN: 0026-7015. DOCUMENT TYPE: Journal CA Section: 61 (Water) Section cross-reference(s): 79 Trace amts. of Cd in water were detd. by preconcn. and anodic stripping voltammetry. Glass beads (150-200 mesh) were immersed in 10% trichlorooctadecylsilane [112-04-9] soln. for 8 h. and the glass beads were packed in a column. 2-(2-Pyridylazo)-5-diethylaminophenol soln. (0.05%) was added to Cd soln. (<0.06 mg/L) at pH 9.5. The Cd complex soln. was passed through the glass beads packed column and the column was eluted with an eluent (EtOH: 0.1 M HCl: CHCl3 = 7:2:1). The eluate was heated with 30 % H2O2 and NH2OH.HCl for the redn. of Fe3+ and then evapd. to dryness. The evapn. residue was dissolved with a supporting electrolyte and Cd was detd. by anodic stripping voltammetry. Detection limits were 0.01-0.12 mg Cd/L. The method was suitable for the anal. of river and seawater contg. < 0.1 mg Cd/L.

Purification of water

Purification of water. (Yamamura Kagaku Kenkyusho K. K., Japan). Jpn. Kokai Tokkyo Koho JP 59123584 A2 17 Jul 1984 Showa, 3 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C02F001-28. APPLICATION: JP 82-234271 28 Dec 1982. DOCUMENT TYPE: Patent CA Section: 61 (Water) For manuf. of ultrapure water, advanced treatment of wastewater, and purifn. of drinking water, raw water is passed through an alkyl group-bonded silica gel or a mixt. thereof prepd. by silane treatment of porous silica gel. The method is simple and economical and can be carried out on a large scale. Thus, silica gel was treated with trichlorooctadecylsilane [112-04-9] and the remaining Cl was methoxylated and trimethylsilylated to give an alkyl group-bonded silica gel. Raw water (COD 70 ppm, bacteria count 6 ′ 105/mL), pre-treated to remove suspended solids, colloidal substances, and (free) salts, was passed through a purifying app. packed with the above silica gel; and after removal of bacteria, the effluent was sterilized with O3 to give ultrapure water (COD 0.1 ppm, bacteria ￡0.1/mL).