Solid phase extraction of mercury on sulfur loaded with N-(2-chloro benzoyl)-N′-phenylthiourea as a new adsorbent and determination by cold vapor atomic absorption spectrometry

• Published in: Talanta (Oxford) Vol. 78; no. 4; pp. 1293 - 1297
• Main Authors: Pourreza, N., Parham, H., Kiasat, A.R., Ghanemi, K., Abdollahi, N.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2009; Elsevier
• Subjects: Absorption; Adsorption; Analytical chemistry; Calibration; Cations; Chemistry; Cold vapor atomic absorption spectrometry (CV-AAS); Exact sciences and technology; Fresh Water - analysis; Hydrogen-Ion Concentration; Marine samples; Mercury; Mercury - analysis; Mercury - isolation & purification; N-(2-chloro benzoyl)-N′-Phenylthiourea; Phenylthiourea - analogs & derivatives; Phenylthiourea - chemistry; Reproducibility of Results; Seawater - analysis; Solid Phase Extraction - methods; Spectrometric and optical methods; Spectrophotometry, Atomic - methods; Sulfur; Sulfur - chemistry; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - isolation & purification; Cold vapor atomic absorption spectrometry (CV-AAS); Marine samples; Sulfur; N-(2-chloro benzoyl)-N′-Phenylthiourea; Mercury; Solid phase extraction; Elution; Ultratrace compound; Mercury II; Powder; Chemical enrichment; Hydrochloric acid; Mercury ion; Adsorption; Detection limit; Cold vapor; N-(2-chloro benzoyl)-N'-Phenylthiourea; Standard curve; Cold vapor atomic absorption spectrometry; Standard deviation; Solid phase; Seawater; Atomic absorption spectrometry; CV-AAS
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2009.01.056

This paper reports sulfur powder loaded with N-(2-chloro benzoyl)-N′-phenylthiourea as a new solid phase extractor for determination of ultra trace amounts of mercury. The mercury ions were retained on a mini-column filled with the solid phase at a flow rate of 16 mL min −1. The retained Hg(II) ions were eluted with 3 mol L −1 solution of HCl and measured by cold vapor atomic absorption spectrometry (CV-AAS). The mercury vapors were generated by a homemade Reaction Cell-Gas Liquid Separator (RC-GLS). The effect of different variables such as pH, sample flow rate, amounts of ligand loaded on sulfur and SnCl 2 concentration was investigated. Calibration curve was linear in the range of 0.02–1.20 μg L −1 with r = 0.9991 ( n = 8). The limit of detection (LOD) based on three times the standard deviation of the blank was 0.012 and 0.003 μg L −1 when 250 and 1000 mL sample volumes were used, respectively. The relative standard deviation (R.S.D.) for determination of 0.04 and 1.00 μg L −1 of Hg(II) was 3.9 and 1.2% ( n = 8), respectively. The method was successfully applied to determine Hg(II) in water and marine samples.