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Solubility and stability of lead arsenates at 25℃

机译：砷酸铅在25℃下的溶解度和稳定性

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摘要

Lead arsenates were the most extensively used arsenical insecticides in the past. Their residues, especially the water-soluble fractions in environment may pose a potential human health risk. The solubility products (K_(sp) and free energies of formation (ΔG_f~o) of PbHAsO_4-2H_2O(c), Pb_5(AsO_4)_3OH-H_2O(c), Pb_3(AsO_4)_2(c) and Pb_8As_2O_(13)(8PbOAs_2O_5)(c) at 25℃ were determined by precipitation and dissolution experiments. The composition of precipitates depended on the Pb/As molar ratios and pH values. The solid precipitates were lamellar PbHAsO_4-2H_2O(c) at pH = 3 ～ 5 and Pb/As = 1.0, columnar Pb_5(AsO_4)_3OHH_2O(c) at pH = 12-13 and Pb/As = 1.5, Pb_5(AsO_4)_3OHH_2O(c) with little amounts of Pb_8As_2O_(13)(c) at pH = 12-13, Pb/As = 1.67 and 2.0. The mixture of PbHAsO_4-2H_2O(c) and Pb_3(AsO_4)_2(c) formed at pH = 6.51 and Pb/As = 1.5. Based on the analytical results, the solubility products (K_(sp)) of PbHAsO_4-2H_2O(c), Pb_5(AsO_4)_3OHH_2O(c), Pb_3(AsO_4)_2(c) and Pb_8As_2O_(13)(c) were calculated by the computer program PHREEQC as 10~(-10.70)(10~(-7.81) ～ 10~(-14.32)), 10~(-81.75)(10~(-74.37)～ 10~(-84.83)), 10~(-33.83)(10~(-32.05) ～ 10~(-34.49)) and 10~(-174.24)(10~(-156.64) ～ 10~(-178.35)), respectively. Correspondingly, the free energies of formation (ΔG_f~o) of these lead arsenates were calculated to be -1274.36kJ/mol, -2928.33 kJ/mol, -1563.12 kJ/mol and -3909.69 kJ/mol.
机译：砷酸铅是过去使用最广泛的砷杀虫剂。它们的残留物，尤其是环境中的水溶性馏分可能构成潜在的人类健康风险。 PbHAsO_4-2H_2O（c），Pb_5（AsO_4）_3OH-H_2O（c），Pb_3（AsO_4）_2（c）和Pb_8As_2O_（13）的溶解度积（K_（sp）和形成的自由能（ΔG_f〜o）通过沉淀和溶解实验确定了25℃下的（8PbOAs_2O_5）（c），沉淀物的组成取决于Pb / As摩尔比和pH值，固体沉淀物为层状PbHAsO_4-2H_2O（c），pH = 3〜5和Pb / As = 1.0，柱状Pb_5（AsO_4）_3OHH_2O（c）在pH = 12-13和Pb / As = 1.5时，Pb_5（AsO_4）_3OHH_2O（c）在pH值下含少量Pb_8As_2O_（13）（c） = 12-13，Pb / As = 1.67和2.0。在pH = 6.51和Pb / As = 1.5时形成的PbHAsO_4-2H_2O（c）和Pb_3（AsO_4）_2（c）的混合物。通过计算机程序PHREEQC计算出PbHAsO_4-2H_2O（c），Pb_5（AsO_4）_3OHH_2O（c），Pb_3（AsO_4）_2（c）和Pb_8As_2O_（13）（c）的溶解度乘积（K_（sp））为10 〜（-10.70）（10〜（-7.81）〜10〜（-14.32）），10〜（-81.75）（10〜（-74.37）〜10〜（-84.83）），10〜（-33.83）（ 10〜（-32.05）〜10〜（-34.49））和10〜（-174.24）（1 0〜（-156.64）〜10〜（-178.35））。相应地，这些砷酸铅的形成自由能（ΔG_f_o）经计算为-1274.36kJ / mol，-2928.33kJ / mol，-1563.12kJ / mol和-3909.69kJ / mol。

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  • 来源
    《Journal of Environmental Science and Health》 |2009年第13ptaa期|1465-1475|共11页
  • 作者

    HUI-LI LIU; YI-NIAN ZHU; HONG-XIA YU;

  • 作者单位

    State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, China Department of Resources and Environmental Engineering, Guilin University of Technology, Guilin, China;

    Department of Resources and Environmental Engineering, Guilin University of Technology, Guilin, China;

    State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lead arsenate; solubility product; free energy of formation; stability;

    机译：砷酸铅溶解度积形成的自由能;稳定性;

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