US EPA

3786050 

Journal Article 

Part 1. Spectrophotometric determination of trace mercury (II) in dental-unit wastewater and fertilizer samples using the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one and the dual-wavelength beta-correction spectrophotometry 

Hamza, A; Bashammakh, AS; Al-Sibaai, AA; Al-Saidi, HM; El-Shahawi, MS 

2010 

Yes 

Journal of Hazardous Materials
ISSN: 0304-3894
EISSN: 1873-3336 

Elsevier 

AMSTERDAM 

178 

1-3 

287-292 

English 

20149525 

10.1016/j.jhazmat.2010.01.075 

WOS:000278056300037 

http://www.sciencedirect.com/science/article/pii/S0304389410001081
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A simple and low cost method was developed and validated for the determination of trace mercury (II) ions in dental-unit wastewater and fertilizer samples. The method was based upon the reaction of mercury (II) ions with the novel reagent 6-hydroxy-3-(2-oxoindolin-3-ylideneamino)-2-thioxo-2H-1,3-thiazin-4(3H)-one, the formed complex shows an absorption maximum at 505 nm (lambda(max)) in Britton-Robinson (B-R) buffer (pH 4-6).The corrected absorbance of the formed complex at lambda(max) was obtained employing beta-correction spectrophotometric method. Beer's-Lambert law and Ringbom's plots of the colored Hg-reagent complex were obeyed in the concentration range of 0.2-2.0 and 0.32-0.96 microg mL(-1) mercury (II) ions, respectively with a relative standard deviation in the range of 2.1+/-1.3%. The limits of detection (LOD) and quantification (LOQ) of the procedure were 0.026 and 0.086 microg mL(-1) Hg(2+), respectively. The proposed method was applied for the analysis of mercury (II) in dental-unit wastewater and fertilizer samples. The validation of the method was tested by comparison with the data obtained by the inductively coupled plasma-mass spectrometry (ICP-MS). The statistical treatment of data in terms of Student's t-tests and variance ratio f-tests has revealed no significance differences. 

Mercury (II); β-Correction spectrophotometry; Water; Fertilizer; ICP-MS 

JOURNAL OF HAZARDOUS MATERIALS