Indirect determination of sulfide at ultratrace levels in natural waters by flow injection on-line sorption in a knotted reactor coupled with hydride generation atomic fluorescence spectrometry.
A simple and sensitive nonchromatographic approach for indirect determination of sulfide at ultratrace levels in natural waters based on its selective precipitation with Hg2+ on the inner wall of a knotted reactor (KR) was developed for flow injection on-line sorption coupled with hydride generation atomic fluorescence spectrometry (HG-AFS). With the Hg2+ pH kept at 2.0, the HgS precipitation was formed in the KR after a reaction time of 120 s. A 10% (v/v) HCl was introduced to elute the remnant inorganic mercury and to merge with the KBH4 solution (0.05% m/v) for HG-AFS detection. Under the optimal experimental conditions, the sample throughputs were 20 h(-1). The detection limit was found to be 0.05 microg L(-1), and the relative standard deviation (RSD, n = 11) for determination of 2.0 microg L(-1) sulfide was 3.3%. The developed method was successfully applied to the determination of sulfide in a variety of natural water samples and wastewater samples with the gas-phase separation and sorption apparatus.
Jin
Yan
Y
School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry and Key Laboratory of MOE for Life Science, Nanjing University, Nanjing 210093, China.
Wu
Hong
H
Tian
Ye
Y
Chen
Luhong
L
Cheng
Jiongjia
J
Bi
Shuping
S
D000042:Absorption; D001880:Boranes / Q000737:chemistry; D017022:Flow Injection Analysis / Q000295:instrumentation* / Q000379:methods; D005618:Fresh Water / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008628:Mercury / Q000737:chemistry; D008832:Microchemistry; D013050:Spectrometry, Fluorescence / Q000379:methods; D013054:Spectrophotometry, Atomic / Q000379:methods; D013440:Sulfides / Q000032:analysis* / Q000737:chemistry
D001880:Boranes; D013440:Sulfides; D006859:Hydrogen; D008628:Mercury