E.I. Morosanova, A.A. Velikorodny, Yu.A. Zolotov
Fresenius J Anal. Chem., v. 361. p. 305-308 (1998)
ABSTRACT. Two approaches to immobilize complex-forming analytical rea- gents (PAN, PAR, Xylenol orange, Brombenzothiazo, Crystal violet, Ca- dion, and Sulfochlorophenolazorhodanine) for the preparation of new sorbents and indicator powders are suggested: on-line coating of re- versed-phase silica gel by reagents or doping of porous sol-gel silica with reagents. The retention of Ag, Cd, Cu(II), Co(II), Fe(III), Mn(II), Ni, Pb, and Zn on the sorbents developed was investigated. Qu- antitative sorption and desorption conditions were optimized. Procedu- res for the determination of Cd, Cu(II), Fe(III), Pb,and Zn with flame atomic absorption, spectrophotometric, and diffusion scattering spect- rometric detection were elaborated. Detection limits for Cd, Cu(II), Fe(III), Pb, and Zn were 0,003 mg/L, 0,006 mg/L, 0,005 mg/L, 0,040 mg/L, and 0,001 mg/L, respectively. The procedures were used for the analysis of various real samples, e.g. natural and waste waters, and food.