Perchlorate contamination of drinking water sources in Kerala, South India, and its degradation using advanced chemical treatment

Sijimol, M. R.; Aravindakumar, Charuvila T.; Manoj, P.; Devadasan, Dineep; Nejumal, K. K.; Mohan, Mahesh

doi:10.1007/s40974-020-00163-5

Cited by 1 publication

(1 citation statement)

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“…A guideline value of 70 μg/L was set by World Health Organization in 2017 [7], a screening value of 4 μg/L is recommended by Health Canada [8], and a chronic tolerable daily intake of 0.3 μg/kg/day was established by the European Food Safety Authority (EFSA) in 2017 [9]. Perchlorate occurrence in drinking water systems in different countries was recently published [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Trace determination of perchlorate in drinking water by capillary zone electrophoresis with isotachophoresis sample cleanup and conductivity detection

Žabenský

Bodor

Makata

et al. 2022

J of Separation Science

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An analytical test procedure for the direct determination of trace levels of perchlorate in drinking water by isotachophoresis combined with capillary zone electrophoresis was developed. A capillary electrophoresis analyzer with column coupling technology, capable of combining capillaries with different internal diameters, was employed in combination with conductivity detection. This combination of the capillary electrophoresis techniques facilitated preconcentration of the trace analytes and elimination of potentially interfering macro-components. To eliminate the influence of weak and moderately strong acids on the migration of perchlorate, acidic leading electrolyte (pH 3.2) in the isotachophoresis step and acidic background electrolyte (pH 3.9) in the zone electrophoresis step were chosen. The addition of polyvinylpyrrolidone into the electrolytes enhanced the resolution of perchlorate from other anions, especially remaining anionic macro-components. The developed method is characterized by good repeatability of migration time (relative standard deviation less than 0.2%) as well as peak area (relative standard deviation less than 5.9%), linearity (R = 0.9996), recoveries (100-112%), and sample throughput (90 samples/24 h). The limit of quantitation for perchlorate in drinking water was achieved at 12.5 nmol/L (1.25 μg/L). This approach is more sensitive and more robust than transient isotachophoresis and offers advantages over some more established analytical techniques such as ion chromatography.

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