Preconcentration on Organic Solvent-Soluble Membrane Filter and Spectrophotometric Determination of Trace Cobalt in Biological Samples.

Abstract

A sensitive and selective spectrophotometric determination of cobalt (II) using 2-(5-bromo-2-pyri- give strong interference, but other metal ions do not interfere. The calibration curve shows a good proportionarity in the concentration range of 2 ppb to 50 ppb cobalt(II).

Separation/preconcentration of silver(I) and lead(II) in environmental samples on cellulose nitrate membrane filter prior to their flame atomic absorption spectrometric determinations

“…Membrane filters including cellulose nitrate, cellulose acetate, etc. have been used for solid-phase extraction of trace species such as organic species, some anions and heavy metal ions in various media [26][27][28][29][30][31][32][33][34]. The most attractive features of membrane filtration technique are the simplicity and rapidity of the preconcentration procedure, an easily attainable high preconcentration factor, and determination with high precision [35,36].…”

Membrane filtration – atomic absorption spectrometry combination for copper, cobalt, cadmium, lead and chromium in environmental samples

“…Membrane filters including cellulose nitrate, cellulose acetate, etc. have been used for enrichment and separation of trace heavy metal ions in various media like natural waters (Sakai et al, 1997, Soylak et al, 2002, Cpara et al, 2003. Carmine is a reagent for the determination of various metal ions (Wang et al 2001, Maitani et al 1994.…”