LENGTH-OF-STAIN INDICATOR TUBES FOR THE DETERMINATION OF METALS IN WATER AND SOLUTIONS

Indicator tubes have been proposed for the determination of heavy meta ls in solutions. Preparation procedures for indicator powders based on noncovalent modifications of reversed-phased silica gel sorbents by a nalytical reagents have been developed. The effects of pH of the sampl e, the capacity of the sorbent on the reagent, the flow rate, and the diameter of an indicator tube on the length of the colored zone have b een studied. Procedures for the determination of Co(II), Fe(II, III), Cu(II), Cd, and the total content of heavy metals in water and solutio ns have been elaborated. The procedures have been used to analyze natu ral and waste waters, soil extracts, and industrial solutions.