应用Tessier与BCR(Bureau Community of Reference)形态分析方法以及固体废物浸出毒性浸出法-醋酸缓冲溶液法(HJ/T300-2007)研究了磷酸二氢钠(MSP)对土壤中铅赋存形态以及浸出浓度的影响。研究表明:Tessier法和BCR法均能证实随着磷酸二...应用Tessier与BCR(Bureau Community of Reference)形态分析方法以及固体废物浸出毒性浸出法-醋酸缓冲溶液法(HJ/T300-2007)研究了磷酸二氢钠(MSP)对土壤中铅赋存形态以及浸出浓度的影响。研究表明:Tessier法和BCR法均能证实随着磷酸二氢钠的施加,实验土壤中铅从活泼态向稳定态转化;Tessier法测定的生物活性系数(MF)值较BCR法更为保守;通过线性回归分析发现BCR法测定的MF值相关系数为0.988,优于Tessier法的相关系数0.895;Tessier法与BCR法对污染土壤中铅形态的提取均具有较高的回收率;磷酸二氢钠能有效降低实验土壤中铅的浸出浓度可达98.62%。展开更多
The radical intermediate, which is produced in the process of electroless nickel plating, was detected in the presence of water-soluble trap α-4-pyridy1-N-tert-buty1 nitrone（POBN） or α-phenyl-tert-buty1 nitrone（...The radical intermediate, which is produced in the process of electroless nickel plating, was detected in the presence of water-soluble trap α-4-pyridy1-N-tert-buty1 nitrone（POBN） or α-phenyl-tert-buty1 nitrone（PBN） by electron spin resonance（ESR） spectroscopy. The results obtained indicated that a 16-line（g=2.006 1, aβ<sub>C—H=1.98×10-4 T, aγ<sub>P—H=3.32×10-4 T, aN=aP=15.93×10-4 T） or a 18-line （g=2.004 9, aβ<sub>C—H=aγ<sub>P—H=2.38×10-4 T, aP=17.72×10-4 T, aN=16.20×10-4 T） ESR spectrum was observed in the process of electroless nickel plating when spin trap PBN or POBN was added. The spectra-line patterns and hyperfine coupling parameters were greatly indentical with those in the solution composed of Ti3+（0.01 mol/L）+H2O2（0.05 mol/L）+H2PO-2（0.01 mol/L）+POBN or PBN（0.01 mol/L）. Therefore, the spin adducts formed in the process of electroless nickel plating could be ascribed to the adducts belonging to HPO-·2 and POBN or PBN and it follows that the anion radical HPO-·2 was really produced from the oxidation of sodium hypophosphite in the process of electroless nickel plating.展开更多
文摘应用Tessier与BCR(Bureau Community of Reference)形态分析方法以及固体废物浸出毒性浸出法-醋酸缓冲溶液法(HJ/T300-2007)研究了磷酸二氢钠(MSP)对土壤中铅赋存形态以及浸出浓度的影响。研究表明:Tessier法和BCR法均能证实随着磷酸二氢钠的施加,实验土壤中铅从活泼态向稳定态转化;Tessier法测定的生物活性系数(MF)值较BCR法更为保守;通过线性回归分析发现BCR法测定的MF值相关系数为0.988,优于Tessier法的相关系数0.895;Tessier法与BCR法对污染土壤中铅形态的提取均具有较高的回收率;磷酸二氢钠能有效降低实验土壤中铅的浸出浓度可达98.62%。
文摘The radical intermediate, which is produced in the process of electroless nickel plating, was detected in the presence of water-soluble trap α-4-pyridy1-N-tert-buty1 nitrone（POBN） or α-phenyl-tert-buty1 nitrone（PBN） by electron spin resonance（ESR） spectroscopy. The results obtained indicated that a 16-line（g=2.006 1, aβ<sub>C—H=1.98×10-4 T, aγ<sub>P—H=3.32×10-4 T, aN=aP=15.93×10-4 T） or a 18-line （g=2.004 9, aβ<sub>C—H=aγ<sub>P—H=2.38×10-4 T, aP=17.72×10-4 T, aN=16.20×10-4 T） ESR spectrum was observed in the process of electroless nickel plating when spin trap PBN or POBN was added. The spectra-line patterns and hyperfine coupling parameters were greatly indentical with those in the solution composed of Ti3+（0.01 mol/L）+H2O2（0.05 mol/L）+H2PO-2（0.01 mol/L）+POBN or PBN（0.01 mol/L）. Therefore, the spin adducts formed in the process of electroless nickel plating could be ascribed to the adducts belonging to HPO-·2 and POBN or PBN and it follows that the anion radical HPO-·2 was really produced from the oxidation of sodium hypophosphite in the process of electroless nickel plating.
