Quantification of trace metals in water using complexation and filter concentration

TY - JOUR

T1 - Quantification of trace metals in water using complexation and filter concentration

AU - Dolgin, Bella

AU - Bulatov, Valery

AU - Japarov, Julia

AU - Elish, Eyal

AU - Edri, Elad

AU - Schechter, Israel

PY - 2010/6/15

Y1 - 2010/6/15

N2 - Various metals undergo complexation with organic reagents, resulting in colored products. In practice, their molar absorptivities allow for quantification in the ppm range. However, a proper pre-concentration of the colored complex on paper filter lowers the quantification limit to the low ppb range. In this study, several pre-concentration techniques have been examined and compared: filtering the already complexed mixture, complexation on filter, and dipping of dye-covered filter in solution. The best quantification has been based on the ratio of filter reflectance at a certain wavelength to that at zero metal concentration. The studied complex formations (Ni ions with TAN and Cd ions with PAN) involve production of nanoparticle suspensions, which are associated with complicated kinetics. The kinetics of the complexation of Ni ions with TAN has been investigated and optimum timing could be found. Kinetic optimization in regard to some interferences has also been suggested.

AB - Various metals undergo complexation with organic reagents, resulting in colored products. In practice, their molar absorptivities allow for quantification in the ppm range. However, a proper pre-concentration of the colored complex on paper filter lowers the quantification limit to the low ppb range. In this study, several pre-concentration techniques have been examined and compared: filtering the already complexed mixture, complexation on filter, and dipping of dye-covered filter in solution. The best quantification has been based on the ratio of filter reflectance at a certain wavelength to that at zero metal concentration. The studied complex formations (Ni ions with TAN and Cd ions with PAN) involve production of nanoparticle suspensions, which are associated with complicated kinetics. The kinetics of the complexation of Ni ions with TAN has been investigated and optimum timing could be found. Kinetic optimization in regard to some interferences has also been suggested.

KW - Environmental analysis

KW - Heavy metals

KW - Water

UR - http://www.scopus.com/inward/record.url?scp=77952102080&partnerID=8YFLogxK

U2 - 10.1016/j.talanta.2010.02.056

DO - 10.1016/j.talanta.2010.02.056

M3 - 文章

C2 - 20441927

AN - SCOPUS:77952102080

SN - 0039-9140

VL - 81

SP - 1482

EP - 1488

JO - Talanta

JF - Talanta

IS - 4-5

ER -