Bentonite-based functional material as preconcentration system for determination of chromium species in water by flow injection analysis technique

Abstract

Chromium species have different level of toxicities. For example, Cr(VI) is 100 times more toxic than Cr(III). This characteristic makes speciation analysis of chromium become important. This research will discuss about a development of a Flow Injection Analysis-Atomic Absorption Spectrometry (FIA-AAS) technique that utilizes bentonite based functional material as a retention column. The separation, preconcentration and trace analysis of the Cr species in the water has been successfully performed using a Bt-MCCs mini-column in the FIA-AAS system. Analytical performance of the developed method is described as repeatability, linearity, and detection limit. Analytical performance for Cr(III) are 1.78 %, correlation coefficient 0.9975 for the concentration range of 50-600 μg.L À1 , and 2.76 μg.L À1 , respectively. Whereas, analytical performance for Cr(VI) are 0.60 %, correlation coefficient 0.9926 for concentration range of 50-600 μg.L À1 , and 2.42 μg.L À1 , respectively. This limit detection is better than the other selective method that has been reported using AAS as detector and the concentration range can be widened with this limit detection. Evaluation of FIA performance for both of Cr(III) and Cr(VI)is that it has an enrichment factor of 10 times higher, it has a concentration efficiency of 12 h -1 and it has a consumptive index of 12 mL. The analysis that was obtained in Cidurian River, West Java, Indonesia are 38.28 g.L À1 for Cr(III) and 26.73 g.L À1 for Cr(VI), while the accuracy are 98.84 % for Cr(III), and 100.73 % for Cr(VI).

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Evaluation of the effects of significant factors and interactions on the enrichment of arsenic and chromium by pipette tip solid phase extraction using novel P-ZrO2CeO2ZnO nanoparticles/alginate beads

“…Spiking was done at three different levels, ie 2.0, 5.0, and 10.0 µg/L As (V) and Cr. Recovery was calculated as % of the difference between the concentration of the analyte of the spiked sample and the concentration of the analyte in the unspiked sample divided by the amount of the standard spiked as shown in Equation (6).…”

“…𝐶𝐶 𝑑𝑑 −𝐶𝐶 0 𝑠𝑠 ×100 (6) where 𝐶𝐶 𝑠𝑠 : concentration of analyte in spiked sample, 𝐶𝐶 0 : concentration of analyte in unspiked sample and s: the amount of standard spiked.…”

“…Chromium is used in alloying, metal ceramic, manufacture of synthetic rubies, dye paints, leather tanning, metal electroplating, wood preservation, and manufacturing of products for corrosion protection [6]. Cr exists under several oxidation states including II, III, and VI.…”

Sterol Biomarker Discovery In Neurodegenerative Diseases

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