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Determination of Mercury in Fly Ash by Using Flow Injection Cold Vapor Isotope Dilution Inductively Coupled Plasma Mass Spectrometry

Author(s): Jung Ki Suh | Hyung Sik Min | Mohammad Kamruzzaman | Sang Hak Lee

Journal: Mass Spectrometry Letters
ISSN 2233-4203

Volume: 3;
Issue: 2;
Start page: 58;
Date: 2012;
Original page

Keywords: Mercur | Flow injection | Cold-vapo | Isotope dilution-inductively coupled plasma mass spectrometry | BCR CRM | Fly ash

A method based on flow injection-isotope dilution-cold vapor-inductively coupled plasma mass spectrometry (FI-IDCV-ICP/MS) has been applied to determine trace level of mercury in fly ash. 200Hg isotopic spike was added to 0.25 g of BCR176Rfly ash and then decomposed by microwave digestion procedure with acid mixture A (8 mL HNO3 + 2 mLHCl + 2 mL HF) and acid mixture B (8 mL HNO3 + 2 mL HClO4 + 2 mL HF) for applying IDMS. Mercury cold vapor was generatedby using reductant solution of 0.2% (w/w) NaBH4 and 0.05% (w/w) NaOH. The measurements of n(200Hg)/n(202Hg) isotoperatio was made using a quadrupole ICP/MS system. The accuracy in this method was verified by the analysis of certified referencematerial (CRM) of fly ash (BCR 176R). The indicative value of Hg in BCR 176R fly ash was 1.60 ± 0.23 mg/kg (k = 2). The determinedvalues of Hg in BCR 176R fly ash by the method of FI-CV-ID-ICP/MS described in this paper were 1.60 ± 0.24 mg/kg(k = 3.18) and the analysis results were in well agreement with the indicative value within the range of uncertainty.
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