Pine needle is a low-cost natural biopolymer, and Cr2O7 2− is a poisonous anions in the environment. In the present paper, pine needle powder was used as a solid phase microextractant in the modification of carbon paste electrode for extraction and determination of Cr2O7 2− anions. The extraction process was monitored by an open circuit potential method, and an apparent first-order rate constant of 0.06474 s−1 was obtained from a Richard model. The extraction isothermal curve follows a logarithm adsorption model with a adsorption equilibrium constant of 5.95. Under the optimal conditions, the concentration of K2Cr2O7 in river water of Shenyang Normal University campus was determined by the potentiometric method in the concentration range of 1.0 × 10−6–1.0 × 10−2 M with a detection limit of 1.0 × 10−7 M (the signal to noise Ratio was 3:1), relative standard deviation of 3.44 %, and standard addition recovery in the range of 94.70–103.5 %. The large amounts of common existing ions such as Cr3+, Cu2+, and SO4 2− showed no interference with the molar ratio up to 100:1, but CrO4 2−, Pb2+ ions showed a great interference in the detection of Cr2O7 2− due to the transformation from CrO4 2− to Cr2O7 2− and precipitations of PbCrO4 and PbCr2O7, respectively.
Research on Chemical Intermediates – Springer Journals
Published: May 21, 2013
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