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New approach for direct analysis of opaque solutions with high content of suspended solids: Determination of calcium and phosphate in raw sugarcane juice
Talanta ( IF 6.1 ) Pub Date : 2021-01-08 , DOI: 10.1016/j.talanta.2021.122095
Marcos A.S. Brasil , Milton K. Sasaki , Marcos Y. Kamogawa

This paper presents a new analytical approach for element concentration determination in samples containing significant concentrations of dissolved and suspended interferences. The proposed system enables to segregate of the complex matrix, species of interest from other interferences with a minimum requirement of reagents and energy. For this purpose, a new cleanup chamber design was implemented with cationic and anionic resins employed under membrane form and the tangential flow of the solution avoided the drawbacks commonly attributed to the packed and fluidized bed columns, such as the formation of preferred paths, increasing hydrodynamic pressure and clogging. The element concentration determination was colorimetrically performed with an automatic flow analysis system. The strategy was validated with the concentration determination of calcium and phosphorus in raw sugarcane juice. Quantification limit of 0.48 to calcium and 1.13 mg L−1 to phosphorus, linear range between 1 and 50 mg L−1, with RSD of 0.50 and 1.50% (n = 11) respectively.



中文翻译:

直接分析具有高悬浮固体含量的不透明溶液的新方法:测定甘蔗原汁中的钙和磷酸盐

本文提出了一种新的分析方法,用于测定含有大量溶解和悬浮干扰物的样品中的元素浓度。所提出的系统能够以最少的试剂和能量需求将复杂的基质,感兴趣的物种与其他干扰分离。为此目的,采用膜形式使用的阳离子和阴离子树脂实施了新的净化室设计,溶液的切向流避免了填充床和流化床塔通常具有的缺点,例如形成优选路径,增加了流体动力压力和堵塞。元素浓度的确定使用自动流量分析系统进行比色法。通过对原蔗汁中钙和磷的浓度测定,验证了该策略。钙和1.13 mg L的定量限为0.48-1至磷,线性范围为1至50 mg L -1,相对标准偏差分别为0.50和1.50%(n = 11)。

更新日期:2021-01-14
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