A new method of analysis of peroxydisulfate using ion chromatography and its application to the simultaneous determination of peroxydisulfate and other common inorganic ions in a peroxydisulfate matrix |
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Authors: | Khan Nymul E Adewuyi Yusuf G |
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Affiliation: | Department of Chemical and Bioengineering, North Carolina A&T State University, 1601 East Market Street, Greensboro, NC 27411, USA. |
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Abstract: | A new method for the determination of peroxydisulfate using ion chromatography has been developed. Elution of peroxydisulfate was effected by isocratic elution using 200 mM NaOH at 40°C. A modification of the method using gradient elution was able to simultaneously determine other common inorganic ions (nitrate, nitrite, sulfate and chloride) down to significantly low concentrations in a peroxydisulfate matrix. The relative standard deviations (RSD) were in the range of 0.5-5%, for peak areas and <0.2% for peak retention times. The recoveries were between 95% and 120% for a concentration range of about 0.5-42 ppm. The limit of detection for peroxydisulfate ion was 0.2 ppm and for the other ions were ≤2×10(-2) ppm. The calibration curves were linear with slope and intercepts close to 1 and 0, respectively. |
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Keywords: | Inorganic anions Peroxydisulfate analysis Temperature effects Separation optimization Retention behavior Gradient elution |
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