the composite diazotization coupling reaction of sulfanilic acid and n, ndimethylaniline was used for the precise, accurate, and rapid determination of trace amounts of nitrite ion (0.02-3 µg/ml). the reaction was monitored spectrophotometrically by measuring the absorbance of the produced methyl orange at 510 nm by a fixed the method of 5.0 minutes. the relative standard deviation for the dete...

background: accumulation or deficiency of trace elements can occur in hemodialysis patients and it increases risk of cardiovascular or other organs disorders. special ions levels such as sodium and bicarbonate in dialysis fluid are accurately regulated but the remaining elements are not regularly measured. aluminum and lead belong to the biologic performance free heavy metals .they also has a t...

We have studied the contents of trace elements of nutritional or toxicological interest in 90 samples of whole, low-fat, skim, condensed, evaporated and powdered milks. Slurries of the samples were prepared with Triton X-100 and analysed using electrothermal atomic absorption spectrometry. The temperature-time programme of the graphite oven was optimized for each element, and the accuracy, prec...

INTRODUCTION Accumulation of trace elements occurs in conditions of decreased kidney function. In some conditions, increased trace elements can have toxic features. On the other hand, studies are showing that concentration of some trace elements could be decreased in ERSD patients as well. The most important factor affecting trace element concentration in ERSD patients is the degree of renal fa...

With the development of industry and agriculture, organotin compounds are widely used as stabilizers, catalysts, and biocides.1 The use of organotin compounds as antifouling paints has led to deleterious effects for nontarget aquatic life even at low levels below several ng L–1. The fate of organotin compounds in the environment involves biotic and abiotic dealkylation processes leading to the ...