[Objective] The research aimed to study reductive dechlorination effect of PCBs in groundwater by Fe/Zn bimetal. [Method] Fe/Zn bi- metal as reduction system, PCBs degradation ratio as inspected index, degradation eff...[Objective] The research aimed to study reductive dechlorination effect of PCBs in groundwater by Fe/Zn bimetal. [Method] Fe/Zn bi- metal as reduction system, PCBs degradation ratio as inspected index, degradation effect of PCBs by Fe/Zn bimetallic system when adding self- made hydroxypropyl-β-cyclodextdn （HP-β-CD） was studied. Meanwhile, we investigated the influences of loading ratio and Fe-Zn dosage on PCBs dechlorination. [ Result] PCBs was significantly solubilized by the synthesized HP-β-CD. With increase of the HP-β-CD concentration, the apparent solubility of PCBs increased linearly, forming 1：1 inclusion complex. When Fe-Zn dosage was 10 g, and mass fraction of Zn was 7%, the dechlori- nation efficiency of 321 μg/L PCBs was 47.6% after degrading for 7 d at 10 ℃. [ Condusion] The research provided theoretical guiding for in situ remediation of the qroundwater contaminated bv PGBs.展开更多
【目的】探索建立基于近红外光谱技术的土壤微量元素监测技术。【方法】采集三峡库区(重庆)主要加工甜橙基地果园背景土壤样品168个,随机选取100个作为建模样本,其余为检验样本;测定所有样本的近红外反射光谱和土壤Fe、Mn、Zn全含量;运...【目的】探索建立基于近红外光谱技术的土壤微量元素监测技术。【方法】采集三峡库区(重庆)主要加工甜橙基地果园背景土壤样品168个,随机选取100个作为建模样本,其余为检验样本;测定所有样本的近红外反射光谱和土壤Fe、Mn、Zn全含量;运用最佳光谱预处理方法和偏最小二乘法(partial least square method,PLS)及内部交叉验证方法建立校正模型,并进行模型精度检验。【结果】变量标准化(standard normal variables,SNV)为土壤Fe、Mn、Zn含量近红外光谱预测的最佳光谱预处理方法;运用SNV光谱预处理和偏最小二乘法(PLS)及内部交叉验证法建立的土壤Fe、Mn、Zn含量校正模型,95%置信区间内的预测精度分别为92.65%、95.59%和95.59%。【结论】利用近红外反射光谱技术进行土壤Fe、Mn、Zn含量检测可行且精度较高。展开更多
基金Supported by National Natural Science Fund Item,China(50879029 /E090301)Department of Science and Technology Item in Jilin Province,China(20090415)
文摘[Objective] The research aimed to study reductive dechlorination effect of PCBs in groundwater by Fe/Zn bimetal. [Method] Fe/Zn bi- metal as reduction system, PCBs degradation ratio as inspected index, degradation effect of PCBs by Fe/Zn bimetallic system when adding self- made hydroxypropyl-β-cyclodextdn （HP-β-CD） was studied. Meanwhile, we investigated the influences of loading ratio and Fe-Zn dosage on PCBs dechlorination. [ Result] PCBs was significantly solubilized by the synthesized HP-β-CD. With increase of the HP-β-CD concentration, the apparent solubility of PCBs increased linearly, forming 1：1 inclusion complex. When Fe-Zn dosage was 10 g, and mass fraction of Zn was 7%, the dechlori- nation efficiency of 321 μg/L PCBs was 47.6% after degrading for 7 d at 10 ℃. [ Condusion] The research provided theoretical guiding for in situ remediation of the qroundwater contaminated bv PGBs.
文摘【目的】探索建立基于近红外光谱技术的土壤微量元素监测技术。【方法】采集三峡库区(重庆)主要加工甜橙基地果园背景土壤样品168个,随机选取100个作为建模样本,其余为检验样本;测定所有样本的近红外反射光谱和土壤Fe、Mn、Zn全含量;运用最佳光谱预处理方法和偏最小二乘法(partial least square method,PLS)及内部交叉验证方法建立校正模型,并进行模型精度检验。【结果】变量标准化(standard normal variables,SNV)为土壤Fe、Mn、Zn含量近红外光谱预测的最佳光谱预处理方法;运用SNV光谱预处理和偏最小二乘法(PLS)及内部交叉验证法建立的土壤Fe、Mn、Zn含量校正模型,95%置信区间内的预测精度分别为92.65%、95.59%和95.59%。【结论】利用近红外反射光谱技术进行土壤Fe、Mn、Zn含量检测可行且精度较高。
