被撤回的出版物: Simultaneous flow-through determination of nitrites, nitrates and their mixtures in environmental and biological samples using spectrophotometry (Retracted Article. See vol 75, pg 1148, 2008)

TALANTA

卷:66

Article; Retracted Publication

Suvardhan, K ; Kumar, KS ; Babu, SH ; Jayaraj, B ; Chiranjeevi, P

关键词: 4,4 '-methylene-bis-m-nitroaniline;    nitrite ion;    nitrate ion;    spectrophotometry;    water;    soil;    human serum and urine samples;   

DOI  :  10.1016/j.talanta.2004.11.025

来源: Elsevier

【 摘 要 】

Newly synthesised 4,4'-methylene-bis-m-nitroaniline has been used to detect nitrites, nitrates, their mixtures in environmental and biological samples. The method is based on the reaction of nitrite with 4,4'-methylene-bis-m-nitroaniline in HCl medium and the concentration of diazonium salt formed, monitored through simultaneous flow by spectrophotometrically. The absorbance of the resultant red colored diazonium salt was measured at 495 nm and stable for more than 12 h. The determination of nitrates can be carried out by using the same reaction prior to reduction in a flow-through reductor column containing zinc dust coated polyurethane foam. The reaction and flow conditions of the full experimental design were optimised. The molar absorptivity and Sandell's sensitivity were found to be 7.5 x 10(4) 1 mol(-1) cm(-1) and 0.00062 mu g ml(-1). Detection limits for nitrite and nitrate were 0.10 and 0.12 mu g ml(-1), respectively. The detailed study of various interference made the confirmation of high selectivity of the method. The method was successfully applied to the determination of nitrites and nitrates in water, soil and biological samples. The results obtained were agreed with the reported methods at the 95% confidence level. (c) 2004 Elsevier B.V. All rights reserved.

【 授权许可】

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