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几种聚氧乙烯型非离子表面活性剂的分光光度法测定及其应用 总被引:16,自引:0,他引:16
介绍了几种聚氧乙烯型非离子表面活性剂的KI-I2分光光度法测定,讨论不同实验条件对测定的影响。结果表明,以碘-碘化钾溶液为显色剂的KI-I2分光光度法测定波长为500nm,显色时间为120min,Brij35,Brij30,TritonX-100和Tween-80工作曲线相关系数在0.9971~0.9995之间;检测范围分别为0.2~25mol/L、0.4~25mol/L、1.5~50mol/L和0.5~50mg/L;操作简单,酸稳定性好,大部分盐类、非离子和阴阳表面活性剂、土壤腐植酸、土壤浸提液对测定的干扰小;易水解的Al3 和Fe3 对测定有较大的干扰,但加酸后即可消除。方法直接用于测定聚氧乙烯型非离子表面活性剂在土壤上的吸附等温线获得了满意的效果。 相似文献
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The effectiveness of the solubilization and photodegradation of β-cyclodextrin (β-CD) and hydroxypropyl-β- cyclodextrin (HPCD) on two hydrophobic organic compounds (HOC) of methyl parathion and pentachlorophenol was investigated. The results indicate that the solubilization or photodegradation of two HOC were influenced by complexing with β-CD or HPCD. The solubility of pentachlorophenol (PCP) was increased linearly with β-CD concentration. The solubility of methyl parathion (MPT) was increased with the increase of β-CD concentration initially, however, as the β-CD concentration was enhanced above 3 g/L, the solubility was decreased with increase of β-CD concentration. The solubilities of two HOC were increased linearly with the increase of HPCD concentration. Although the photodegradation of MPT was improved, the photodegradation of PCP was restrained by complexation of HOC with β-CD or HPCD. In a word, the effectiveness of photodegradation or solubilization of HPCD was more significant than that of β-CD. One potential application of such a method was the in situ remediation of hydrophobic organic pollutants in contaminated soil and groundwater or industrial waste streams. 相似文献
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β-环糊精及其衍生物对两种农药的不同光解特性 总被引:4,自引:0,他引:4
研究了β-环糊精(β-CD)及其衍生物羟丙基-β-环糊精(HPCD)对两种疏水性有机农药(甲基对硫磷和五氯酚)的增溶作用和光解影响.实验结果表明,对农药的增溶作用或光解的影响主要是由于农药与β-CD或HPCD形成包合物而引起的.β—CD能提高五氯酚的水溶性,但对甲基对硫磷的增溶作用表现为低浓度促进溶解而高浓度抑制溶解;HPCD则能显提高两种疏水性农药的水溶性.β—CD及HPCD与甲基对硫磷形成包合物,选择性定向客体分子而促进其光解;与五氯酚形成稳定的包合物,能保护客体分子而抑制其光解.HPCD对农药的增溶效果和光解的影响比β—CD更显. 相似文献
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