Advance writing with English in use CAE

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A 24 h urine specimen was analyzed by this method and Hg 2§ methylHg§ and ethylHg§ species were found. Other Metals Trialkyltins are the organotins having the greatest biocidal activity in mammalians. A purge and trap flame photometric gas chromatographic technique for speciation of trace organotin and organosulphur compounds in human urine standard reference material was reported by Olson et al. (1983). Urine samples were purged with nitrogen, with or without prior treatment with NaBH 4, and the volatile compounds were trapped on Tenax GC.

C. Speciation in Milk Human milk, cow milk, or infant formulas are the main nutrient fluids for newborn infants. Assuming that the composition of breast milk may satisfy the growing demand of healthy babies during their early months of age, it could be a reference to evaluate the nutritional value of alternative milk formulas. The protein and composition as well as the kind of trace metal of breast milk have been known for the last several years. But the absorption and utilization of the trace metals depend not only on the total amount in the milk but also on the availability of the chemical form in which they occur.

Chromium Speciation of chromium in blood has become an important area of research after it was known that patients with terminal renal failure treated with hemodialysis or continuous ambulatory peritoneal dialysis become iatrogenically loaded with chromium. , 1986). Urasa and Nam (1989) developed a method for chromium speciation using both anion- and cation-separator columns. The 22 M. L. CERVERA, and A. MORALES-RUBIO procedure used DCP-AES detection and required a preconcentration step to achieve a detection limit of 1 ng mL -1.

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