NDLI: Development and Validation of a Spectrophotometric Method to Measure Sulfate Concentrations in Mine Water without Interference

Content Provider	Springer Nature Link
Author	Roy, Arup Das, Bidus Kanti Bhattacharya, Jayanta
Copyright Year	2011
Abstract	Sulfate concentrations are determined in mine water by gravimetric, titrimetric, colorimetric, turbidometric, ion chromatographic, inductively coupled plasma absorption spectrophotometric, and other methods. Accurate sulfate measurement of mine water can be difficult due to interfering groups, cations, and anions, mainly arsenate (AsO$_{4}$ $^{3−}$) and phosphate (PO$_{4}$ $^{3−}$). In this paper, a simple and effective spectrophotometric method is described for the determination of sulfate in mine water. When the SO$_{4}$ $^{2−}$ reacts with barium chloranilate at pH 4.5 in aqueous ethyl alcohol solution, it releases acid-chloranilate, which shows maximum absorption at 350 nm and obeys Beer’s law over the concentration range of 10–1,000 mg/L. Results show that the proposed method was significantly more accurate than a conventional method. Absorbance was found to increase linearly with increasing concentration of sulfate, which is corroborated by the calculated correlation coefficient value of 0.999 (n = 7). The slope and intercept of the equation of the regression line were 0.00091 and 0.00778, respectively. The limit of detection and limit of quantification were found to be 0.03861 and 0.06774 mg/L, respectively. The validity of the described procedure was assessed. Statistical analysis of the result indicated high accuracy and good precision. The proposed method was successfully applied in mine water without interference from common groups like AsO$_{4}$ $^{3−}$ and PO$_{4}$ $^{3−}$. The relative standard deviations of the proposed method ranged from 0.03 to 0.26%, with recoveries of 99.79–101.57%.
Starting Page	169
Ending Page	174
Page Count	6
File Format	PDF
ISSN	10259112
Journal	Mine Water and the Environment
Volume Number	30
Issue Number	3
e-ISSN	16161068
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-02-20
Publisher Institution	International Mine Water Association (IMWA)
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Interference Mine water Spectroscopy Sulfate Validation Hydrogeology Energy Economics Sedimentology Ecotoxicology Geology
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Geotechnical Engineering and Engineering Geology

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