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Sorption of chlorotoluron in ammonium sulfate, urea and atrazine multi-solutes system was investigated by batch experiments. The results showed application of nitrogen fertilizers to the soil could affect the behavior of chlorotoluron. At the same concentration of N, sorption of chlorotoluron decreased as the concentration of atrazine increased on the day 0 and 6 in soil, respectively. The sorption of chlorotoluron increased from 0 to 6 d when soils were preincubated with deionized water, ammonium sulfate and urea solution for 6 d. That indicated incubation time was one of the most important factors for the sorption of chlorotoluron in nitrogen fertilizers treatments. The individual sorption isotherms of chlorotoluron in rubbery polymer and silica were strictly linear in single solute system, but there were competition sorption between pesticides or between pesticides and nitrogen fertilizers. That indicated the sorption taken place by concurrent solid-phase dissolution mechanism and sorption on the interface of water-organic matter or water-mineral matter. 相似文献
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粮食中绿麦隆残留量的气相色谱分析 总被引:2,自引:0,他引:2
本文用六氟丁酸酐直接衍生化气相色谱法测定粮食中绿麦隆农药残留量.粮食样品用甲醇-水提取.滤液用二氯甲烷或三氯甲烷-石油醚混合溶剂萃取,经硅镁吸附剂净化.以丙酮-石油醚为洗脱剂,洗脱液浓缩后用七氟丁酸酐直接衍生化,采用气相色谱法,电子捕获检测器测定.方法的线性范围为0—2.5μg·ml~(-1).对5g粮食样品,方法检出限为0.01mg·kg~(-1).对于小麦、玉米和大豆样品,加标回收率为82.4—91.2%,相对标准偏差为4.1—10.3%.对实际样品的测定和有关单位验证的结果表明,本方法适合于粮食中绿麦隆残留量的测定. 相似文献
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绿麦隆、阿特拉津单一与复合污染对蚯蚓的毒性效应研究 总被引:5,自引:0,他引:5
以赤子爱胜蚓为研究对象,采用滤纸急性毒性实验研究了农药绿麦隆、阿特拉津对蚯蚓的单一和复合毒性效应。单一毒性实验表明,绿麦隆与阿特拉津单独存在时,均对赤子爱胜蚓产生毒性。阿特拉津对蚯蚓的毒性大于绿麦隆,绿麦隆和阿特拉津48h的半致死质量浓度分别为189.64和43.33mg·L-1。复合毒性实验表明,绿麦隆与30mg·L-1和40mg·L-1的阿特拉津复合,其48h的半致死量分别为116.03和48.14mg·L-1。绿麦隆和阿特拉津的复合污染对蚯蚓具有明显的协同作用,而这种协同作用与污染物的质量浓度有关。 相似文献
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研究了在2种来源的DOM(水溶性有机物)和绿麦隆作用下,小麦幼苗在不同培养时间(4和10 d)组织累积量和抗氧化系统的响应,探讨了小麦幼苗在DOM作用下对绿麦隆胁迫的毒性响应影响及机制. 结果表明:在不同的培养期内,绿麦隆均抑制了小麦幼苗的生长,而2种不同来源的DOM均缓解了绿麦隆对植株的毒性. DOM的施加使绿麦隆胁迫下小麦叶和根中的丙二醛(MDA)含量降低,同时绿麦隆诱导的超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活力也有所降低,然而过氧化物酶(POD)和谷胱甘肽巯基转移酶(GST)的活性却有一定程度的增高. 使用RT-PCR半定量分析方法对SOD和GST的酶活性变化进行了分析,以确证DOM缓解绿麦隆对小麦幼苗的毒性调节机制. 相似文献
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绿麦隆在水溶液中光降解动力学研究 总被引:3,自引:0,他引:3
以低功率紫外灯和荧光灯为光源对水溶液中的绿麦隆进行光降解,探讨了光解的影响因素.研究表明,绿麦隆在紫外光照下较易降解,其光解符合准一级动力学方程,反应速率常数为23×10-2min-1;在水环境中经长期光照会逐渐矿化为Cl-、CO2、NO-3等无机离子;运用GC/MS技术鉴定了绿麦隆的几种光解中间产物,异氰酸(3氯—4甲基)—苯酚酯是主要中间体,并推测了绿麦隆的光解反应历程. 相似文献
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