Reversible intermittent flow-injection determination of mercury in sediments and vinasses by cold vapor atomic absorption spectrometry

✍ Scribed by José Anchieta Gomes Neto; Luis Fabrício Zara; Ademir Santos; Julio Cesar Rocha; Arnaldo Alves Cardoso

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 165 KB
• Volume: 11
• Category: Article
• ISSN: 0895-7533
• DOI: 10.1002/(sici)1098-2728(1999)11:5<304::aid-lra10>3.0.co;2-c

✦ Synopsis

A reversible intermittent flow-injection procedure is proposed for the automated determination of mercury in sediments and vinasses by cold vapor atomic absorption spectrometry, CVAAS. Solutions of sample and stannous chloride are carried by two air streams and sequentially injected into the generator/separator chamber in a segmented asynchronous merging zone configuration. The intermittent flow in the forward direction carries the mercury vapor through the flow cell, and in the backward direction, it aspirates the remaining solution from the vessel to waste. We investigated composition and concentration of reagents, flow rates, commutation times, reactor configuration, and conditions for mercury release. The accuracy was checked by mercury determination in a certified sediment and spiked vi-