Simultaneous determination of arsenic(III) and arsenic(V) by flow injection-inductively coupled plasma-atomic emission spectrometry (ICP-AES) with ultrasonic nebulization.
A dual-column protocol for the sequential determination of As(III) and As(V) is described using inductively coupled plasma-atomic emission spectrometry (ICP-AES) with ultrasonic nebulization (USN). This procedure employed a 16-way valve containing two different homemade mini columns for selective preconcentration of As(III) and As(V). One column was filled with Muromac A-1, which selectively preconcentrated As(III) at pH 3 after complexation with ammonium pyrrolidine dithiocarbamate (APDC, 0.05%). The effluent of the first column was then passed through the second column, which was filled with an anion-exchange resin to collect As(V). By using 0.6 M sodium hydroxide, both species were eluted sequentially and measured by ICP-AES. Enrichment factors of 136 (17 for micro column x8 for USN) for As(V) and 160 (20 for micro column x8 for USN) for As(III) were achieved with 4 min preconcentration. With the proposed procedure, the detection limits were calculated to be 0.7 micro g L(-1) for As(V) and 0.8 micro g L(-1) for As(III) based on (3 sigma) blank determination ( N=10). The relative standard deviations for 20 micro g L(-1) of As(V) and As(III) were 5.8% and 6.5%, respectively. The recovery for spiked water samples was in the range of 85-112%.
Karthikeyan
Sathrugnan
S
National Institute of Advanced Industrial Science and Technology (AIST), Chugoku, Kure 737-0197, Japan.
Hirata
Shizuko
S
D001149:Arsenates / Q000032:analysis* / Q000737:chemistry; D018053:Arsenites / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods; D009330:Nebulizers and Vaporizers; D011759:Pyrrolidines / Q000737:chemistry; D013859:Thiocarbamates / Q000737:chemistry; D014465:Ultrasonics; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000592:standards
D001149:Arsenates; D018053:Arsenites; D011759:Pyrrolidines; D013859:Thiocarbamates; D014874:Water Pollutants, Chemical; C020972:pyrrolidine dithiocarbamic acid