Micro-organic Ion-associate Phase Extraction/micro-volume Back-extraction for the Preconcentration and GF-AAS Determination of Cadmium, Nickel and Lead in Environmental Water

Syeda Mushahida-Al-Noor; Ryo Murashima; Takuya Okazaki; Shigeru Taguchi; Hideki Kuramitz; Noriko Hata

doi:10.2116/analsci.18N011

Micro-organic Ion-associate Phase Extraction/micro-volume Back-extraction for the Preconcentration and GF-AAS Determination of Cadmium, Nickel and Lead in Environmental Water

Anal Sci. 2018 Dec 10;34(12):1445-1448. doi: 10.2116/analsci.18N011. Epub 2018 Sep 7.

Authors

Syeda Mushahida-Al-Noor¹, Ryo Murashima¹, Takuya Okazaki¹, Shigeru Taguchi¹, Hideki Kuramitz¹, Noriko Hata¹

Affiliation

¹ Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering (Sci. Div.), University of Toyama.

PMID: 30197383
DOI: 10.2116/analsci.18N011

Abstract

Micro-organic ion-associate phase (IAP) extraction was combined with a micro-volume back-extraction (MVBE) to reduce coexisting components and viscosity in the concentrates. Heavy metals were converted into a complex with 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol in a 40-mL sample solution, and were extracted into ion associates. After centrifugation and discarding the aqueous phase, trace metals were stripped from IAP into a nitric acid solution, followed by GF-AAS determination. Only one vessel was required for 400-fold enrichment. The detection limits (3σ_b) for Cd, Ni, and Pb were 0.6, 3.7, and 0.8 ng/L, respectively. This method was applied in recovery tests in seawater.

Keywords: GF-AAS; Ion-associate phase; micro-volume back-extraction.