Preparative separation of arsenate from phosphate by IRA-400 (OH) for oxygen isotopic work.

Preparative separation of arsenate from phosphate by IRA-400 (OH) for oxygen isotopic work.
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使用 IRA-400 (OH) 制备分离砷酸盐和磷酸盐以进行氧同位素工作

DOI:
10.1016/j.talanta.2012.11.069
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发表时间:
2013
期刊:
影响因子:
6.1
通讯作者:
Khelashvilli
Khelashvilli
中科院分区:
化学1区
文献类型:
--
作者:
Berner;Khelashvilli

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本文报道了用伊拉-400(OH)阴离子交换树脂从天然沃茨中分离砷、磷的一系列试验。用不同用量的树脂(0.05-1.00g)与含砷1 mg/L、磷10 mg/L的溶液搅拌,建立了Freundlich吸附等温线,并研究了pH和P/As比对吸附的影响。发现在此浓度下,0.5g伊拉-400(OH)可在1h内对砷、磷进行定量吸附。在3.6-11.1范围内,pH值对树脂的吸附行为没有影响,但在pH值为1.5时,树脂对砷酸根和磷酸根的吸附量均降至接近于零。用P/As比在1和30之间的溶液进行的实验表明,浓度比对吸附的影响也很小。用2 mol/LHNO_3或HCl可以有效地选择性解吸阴离子,但如果分离目的是沉淀砷酸盐用于氧同位素工作,则使用HCl是不可行的。所报道的树脂的吸附/脱附性质也由通过用配备有荧光检测装置的扫描电子显微镜研究树脂颗粒获得的数据支持。
The paper reports about a series of tests carried out to find out the optimal conditions for the preparative separation of arsenate and phosphate from natural waters, using the anion exchange resin Amberlite IRA-400 (OH). Freundlich isotherms have been constructed on basis of data obtained by stirring different amounts of resin (0.05–1.00g) with solutions containing 1mg/L As and 10mg/L P in form of arsenate and phosphate and the effect of pH and P/As ratio on adsorption was investigated. It was found that at these concentrations 0.5g of IRA-400 (OH) can adsorb quantitatively arsenate and phosphate within 1h. In a range of 3.6–11.1, pH seems to have no influence on the adsorption behavior of the resin, but at pH 1.5 the adsorption of both arsenate and phosphate drops to values close to zero. Experiments with solutions with P/As ratios in a range between 1 and 30 have shown that the concentration ratios have also little effect on adsorption. An efficient selective desorption of the anions could be achieved with 2mol/L HNO3or HCl, but the use of HCl is impracticable if the separation aims at precipitating arsenate for oxygen isotopic work. The reported adsorption/ desorption properties of the resin are supported also by data obtained by investigating the resin particles with a scanning electron microscope equipped with a fluorescence detection device.
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发表时间: 2000
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发表时间: 1989
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