基于国内两种标准方法比较磷酸钠与 磷酸二氢钠对铅污染土壤的稳定化效果 (Chinese)

To compare the stabilizing effects of sodium phosphate and sodium dihydrogen phosphate on lead contaminated soil. This study used two domestic standard methods 11 Solid waste Extraction procedure for leaching toxicity Horizontal vibration method11 (SELH) (HJ 557 2010) and Solid waste Extraction procedure for leaching toxicity Acetic acid buffer solution method11 (SELA) (HJT 300 2007). Using the above two methods to extract two kinds of lead contaminated soil, which are stable with phosphate amendments (Na 3 PO 4 NaH 2 PO 4 ) was employed at a 3 and 8 P/Pb molar ratio in different incubation time(7, 20, 30 d). The SELA Pb results show that Na 3 PO 4 and NaH 2 PO 4 amendment significantly reduced Pb mobilization. At the 30th day of culture, N 3 PO 4 was employed at a 8 P/Pb molar ratio, compared with the control groups SELA Pb was reduced by 96. 8%. The extraction results of SELH Pb showed that the addition of Nag PO4 and NaH PO 4 increased the concentration of ext r actable lead in the soil compared to the control groups and addition of Na 3 PO 4 in the YN and HN groups had a higher concentration of SELH Pb than addition of NaH 2 PO 4 . At the 30th day of culture, Na 3 PO 4 was employed at a 8 P/Pb molar ratio, SELH Pb reached 3.72 mg/L. Under the conditions of this experiment, the two extraction methods have different extractable lead concentration trends within 7 30 d. The extractable lead concentration of the acetate buffer solution method shows a decreasing trends while the horizontal shaking method extracts the lead concentration shows an upward trend. The addition of Na 3 PO 4 and NaH 2 PO 4 increases the concentration of lead extracted by the horizontal shaking method in the soil, which has a certain risk to heavy metal lead contaminated soil, and Na 3 PO 4 as a soil lead pollution remediation agent has a higher risk than NaH 2 PO 4 . [ABSTRACT FROM AUTHOR]

为比较磷酸钠与磷酸二氢钠对铅污染土壤的稳定化效果, 采用国内两种标准方法 《固体废物浸出毒性浸出方法水平 振荡法XHJ 557 2010)和《固体废物浸出毒性浸出方法醋酸缓冲溶液法XHJT 300 2007)浸提不同添加比例[P ： Pb --3 ： 1、 P: Pb-8: 1(摩尔比)]、不同培养时间(7,20,30 d)条件下磷酸钠、磷酸二氢钠稳定的两种(HN、YN)铅污染土壤。醋酸缓冲溶液 法浸提结果表明, 磷酸钠、磷酸二氢钠对土壤中铅具有良好的稳定化效果, 培养至第30 d时, 添加磷酸钠且P ： Pb-8: 1时, 与对 照组相比, 可提取态铅浓度降低了 96.8%。水平振荡法浸提结果表明, 相较于对照组, 添加磷酸钠、磷酸二氢钠使土壤中可提取态 铅浓度增加, 且磷酸钠各添加比例在YN、HN组的水平振荡法可提取态铅浓度均比磷酸二氢钠各添加比例的浓度高。培养至第 30 d时, 添加磷酸钠且P: Pb-8: 1时, 可提取态铅浓度达3. 72 mg/Lo在本试验研究条件下, 两种浸提方法在7〜30 d内可提取 态铅浓度趋势不同, 醋酸缓冲溶液法可提取态铅浓度呈降低趋势, 而水平振荡法可提取态铅浓度呈上升趋势。添加磷酸钠、磷酸 二氢钠使得土壤中水平振荡法提取态铅浓度增加, 对重金属铅污染土壤具有一定风险性, 且磷酸钠作为土壤铅污染修复剂比磷酸 二氢钠风险高. [ABSTRACT FROM AUTHOR]

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