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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Rate of phosphoantimonylmolybdenum blue complex formation in acidic persulfate digested sample matrix for total dissolved phosphorus determination: Importance of post-digestion pH adjustment
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Rate of phosphoantimonylmolybdenum blue complex formation in acidic persulfate digested sample matrix for total dissolved phosphorus determination: Importance of post-digestion pH adjustment

机译:酸性过硫酸盐消化样品基质中总溶解磷测定中磷锑钼钼蓝配合物的形成速率:消化后pH调节的重要性

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摘要

Acidic persulfate oxidation is one of the most common procedures used to digest dissolved organic phosphorus compounds in water samples for total dissolved phosphorus determination. It has been reported that the rates of phosphoantimonylmolybdenum blue complex formation were significantly reduced in the digested sample matrix. This study revealed that the intermediate products of persulfate oxidation, not the slight change in pH, cause the slowdown of color formation. This effect can be remedied by adjusting digested samples pH to a near neural to decompose the intermediate products. No disturbing effects of chlorine on the phosphoantimonylmolybdenum blue formation in seawater were observed. It is noted that the modification of mixed reagent recipe cannot provide near neutral pH for the decomposition of the intermediate products of persulfate oxidation. This study provides experimental evidence not only to support the recommendation made in APHA standard methods that the pH of the digested sample must be adjusted to within a narrow range of sample, but also to improve the understanding of role of residue from persulfate decomposition on the subsequent phosphoantimonylmolybdenum blue formation. (C) 2008 Elsevier B.V. All rights reserved.
机译:酸性过硫酸盐氧化法是用于消化水中样品中溶解的有机磷化合物以确定总溶解磷的最常用方法之一。据报道,在消化后的样品基质中,磷锑基钼钼蓝络合物的形成速率显着降低。这项研究表明,过硫酸盐氧化的中间产物,而不是pH的轻微变化,会导致颜色形成的减慢。可以通过将消化后的样品的pH值调节至接近神经以分解中间产物的方式来弥补这种影响。没有观察到氯对海水中磷锑钼钼蓝形成的干扰作用。注意到混合试剂配方的修改不能为过硫酸盐氧化的中间产物的分解提供接近中性的pH。这项研究提供了实验证据,不仅支持APHA标准方法中提出的建议,即必须将消化后的样品的pH值调整到窄范围内,而且还可以提高对过硫酸盐分解后残留物对后续作用的认识。磷锑钼钼蓝的形成。 (C)2008 Elsevier B.V.保留所有权利。

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