Determination of phosphate in hydroponic nutrient solutions using flow injection potentiometry and a cobalt-wire phosphate ion-selective electrode
Determination of phosphate in hydroponic nutrient solutions using flow injection potentiometry and a cobalt-wire phosphate ion-selective electrode
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DOI：
10.1016/s0039-9140(03)00229-7
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发表时间：
2003-08-29
期刊：
影响因子：
6.1
通讯作者：
Phan, C
中科院分区：
文献类型：
--
作者：
De Marco, R;Phan, C
采用钴丝离子选择性电极（伊势）直接流动注射电位法（FIP）测定水培营养液中的磷酸盐。使用FIP技术分析了合成水培营养液、商业水培营养液和工作水培农场营养液中的磷酸盐。结果表明，FIP的结果相比，有利的标准分析方法，如分光光度法和间接光度离子对色谱法。在5.0 x 10-（4-）1.0 x 10（-2）x M H2 PO 4-浓度范围内，4次单独校准获得了斜率为-（47.57+/-0.03）mV/10次方、截距为-（169.7+/-0.1）mV的可再现FIP响应曲线。使用使用固定干扰方法独立测定的选择性系数，将Cl-、NO3-和SO24-干扰的阴离子校正应用于所有样品。然而，发现阴离子校正是不必要的，因为偏差落在钴丝伊势技术的实验误差范围内（即+/-2-5% R.S.D.）。所提出的FIP方法能够直接测定水培营养液中的磷酸盐。(C)2003 Elsevier B. V.保留所有权利。
The direct flow injection potentiometric (FIP) analysis of phosphate in hydroponic nutrient solution has been carried out using a cobalt-wire ion-selective electrode (ISE). Synthetic hydroponic nutrient solution, commercial hydroponic nutrient solution and working hydroponic farm nutrient solution were analysed for phosphate using the FIP technique. It is shown that FIP results compare favourably to standard methods of analysis such as spectrophotometry and indirect photometric ion-pair chromatography. Reproducible FIP response curves with a slope of -(47.57+/-0.03) mV per decade and intercept of -(169.7+/-0.1) mV were obtained for four separate calibrations in the concentration range 5.0 x 10-(4-)1.0 x 10(-2) x M H2PO4-. Anion corrections for interferences by Cl-, NO3- and SO24- were applied to all samples using the selectivity coefficients determined independently using a fixed interference method. Nevertheless, it was found that anion corrections were not necessary, as the deviations fell within the bounds of experimental error for the cobalt-wire ISE technique (i.e. +/-2-5% R.S.D.). The proposed FIP method enables the direct determination of phosphate in hydroponic nutrient solutions. (C) 2003 Elsevier B.V. All rights reserved.