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Development and Validation of Method with Evaluation of Measurement Uncertainty for the Speciation Analysis of Chromium by Ion Chromatography

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Abstract

In the present study a simple, sensitive and accurate method has been developed for the speciation analysis of chromium(III) and chromium(VI) in aqueous solution using ion chromatography separation followed by detection through a UV detector. Chromium(III) was detected as its pyridine-2,6-dicarboxylic acid (PDCA) complex at 365 nm by pre-derivatizing it with eluent containing PDCA. Chromium(VI) was detected by post column derivatization with diphenylcarbazide at 540 nm. This paper discusses in details about the method validation and established each parameter according to the IUPAC and EURACHEM approaches. Method is validated for linearity, accuracy, precision, limit of detection and limit of quantification as per the guide lines. The evaluation of expanded uncertainty in measurement of Cr(III) and Cr(VI) was done at 95 % confidence level (k = 2) according to EURACHEM GUM guide. The method can be applied to determine Cr(III) and Cr(VI) up to 2 mg/kg and 40 µg/kg respectively with associated measurement uncertainty value of about 5 %. The major contribution of uncertainty is due to recovery. The method described in the present study is sensitive, selective and capable of quantifying trace level of Cr(VI) and Cr(III).

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Acknowledgments

The authors are thankful to the Director, CSIR-NPL for his support and permission to publish this paper. The authors are thankful to Mrs. Sunita Raina for her constant help in the analysis by IC. One of the author Ms. Swati is thankful to CSIR for the financial support.

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Authors and Affiliations

  1. CSIR-National Physical Laboratory, K.S. Krishnan Marg, New Delhi, India

    Swati, S. Swarupa Tripathy, Rajiv K. Saxena & Prabhat K. Gupta

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  1. Swati
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  2. S. Swarupa Tripathy
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  3. Rajiv K. Saxena
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  4. Prabhat K. Gupta
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Correspondence to S. Swarupa Tripathy.

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Swati, Tripathy, S.S., Saxena, R.K. et al. Development and Validation of Method with Evaluation of Measurement Uncertainty for the Speciation Analysis of Chromium by Ion Chromatography. MAPAN 30, 131–137 (2015). https://doi.org/10.1007/s12647-014-0130-0

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  • DOI: https://doi.org/10.1007/s12647-014-0130-0

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