[Speciation analysis of mercury by capillary electrophoresis on-line coupled with inductively coupled plasma mass spectrometry based on a micro mist nebulizer and a removable interface].
A method for mercury speciation analysis was developed by CE-ICP-MS with a Micro Mist nebulizer and a removable interface. Contamination of ICP-MS detector by the rising solution was avoided with the use of a removable interface during capillary rinsing. Baseline separation of methylmercury (MeHg) and inorganic mercury (Hg2+) was obtained by CE in a 45 cm x 75 microm i.d. fused-silica capillary at 22.5 kV, while a mixture of 30 mmol(-1) H3BO3 + 10% CH3OH (pH 8.7) acted as running electrolyte. The precisions (RSD, n=5) of migration time and peak area for the mercury species were in the ranges of 3.5%-3.8% and 2.3%-5.1%, respectively. The limits of detection (3sigma) of MeHg and Hg2+ were 47 and 48 microg x L(-1), respectively.
Li
Bao-hui
BH
Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, China.
Yu
Li-ping
LP
Wang
Zhao-hui
ZH
Liu
Li-wen
LW
Yan
Xiu-ping
XP
D001888:Boric Acids / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D013058:Mass Spectrometry / Q000295:instrumentation / Q000379:methods*; D017669:Mercury Compounds / Q000032:analysis* / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D008767:Methylmercury Compounds / Q000032:analysis* / Q000737:chemistry; D017942:Nitric Acid / Q000737:chemistry; D015203:Reproducibility of Results
D001888:Boric Acids; D017669:Mercury Compounds; D008767:Methylmercury Compounds; D017942:Nitric Acid; C032688:boric acid; D000432:Methanol