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高效液相色谱法分析辛溴乳油中的溴氰菊酯 总被引:1,自引:0,他引:1
高效液相色谱法分析辛溴乳油中的溴氰菊酯张瑞亭,张艳霞(沈阳化工研究院,110021)(河北省栾城县植物激素厂)50%辛溴乳油中溴氰菊酯含量很低,企业标准中规定≥0,4%,定量分析比较难。通常采用气相色谱法,其缺点是要用石油醚萃取制剂中的溴氰菊酯,操作... 相似文献
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本文采用了薄层色谱分离-溴量法测定水胺硫磷的含量。试样在石油醚:氯仿:乙酸乙酯=10:2:2的展开剂中,水胺硫磷与杂质分离良好。该法操作方便,精密度和准确性较好。试样测定结果的相对标准偏差为0.28%。加入回收率达99.1% ̄101.6%。 相似文献
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辛.溴氟乳油的反相高效液相色谱分析 总被引:1,自引:0,他引:1
采用RP-HPLC技术,以双内标法一次进样同时测定辛硫磷和溴氟菊酯混配乳油中的两种有效成分含量。在选定的色谱条件下,两种有效成分与两个内标物之间以及与乳油中其他组分之间可实现完全分离。该法准确快速,精度度好。辛硫磷的回收率为99.29-100.7%,溴氟菊酯的回收率为99.34%-100.2%,辛硫磷RSD%=0.26%,溴氟菊酯RSD%=2.51%。 相似文献
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采用反相高效液相色谱法,对溴氰菊酯乳油进行分离和测定。溴氰菊酯的RSD为1.23%,线性相关系数为0.99997,平均回收率为100.1% 相似文献
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T.R. Beck 《Electrochimica acta》1973,18(11):807-814
Experiments were conducted in which a rotating disk of titanium was scraped with a sapphire cutter in HCl solution. The amount of titanium going into solution determined chemically and by oxidation of Ti3+ to Ti(IV) at a gold ring accounted for a large fraction of the anodic current to the scraped surface. The data are consistent with a revised potential-pH diagram taking into account the simultaneous formation of Ti3+ and a metastable passivating oxide. Oxidation of Ti3+ to Ti(IV) on gold was highly irreversible even in 6 M HCl. 相似文献
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40%乐果乳油在甘蓝和土壤中的残留及消解动态 总被引:1,自引:0,他引:1
采取田间试验方法,研究了40%乐果乳油在甘蓝和土壤中的残留动态和最终残留。乐果最低检测量为0.01mg/kg,在甘蓝和土壤中最低检出质量分数为0.03mg/kg。在甘蓝和土壤中的平均回收率为90.25%-110.39%,变异系数为1.51%-5.83%,符合农药残留分析的要求。试验结果表明,乐果在甘蓝和土壤中的消解较快.其半衰期分别为2d和1.5d,药后间隔3、7、10d,乐果在甘蓝中的残留量为ND至9.6989mg/kg,土壤中的残留量为ND至0.1732mg/kg。 相似文献
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超声气升式反应器处理乐果水溶液 总被引:2,自引:0,他引:2
Ultrasonic airlift loop reactor (UALR) shows potential and wide application for wastewater treatment. In this paper the performance and efficiency of UALR in dimethoate degradation were presented. The effects of O3 flow rate, ultrasonic intensity and initial concentration of dimethoate on degradation rate were investigated. UALR imposed a synergistic effect combining sonochemical merit with high O3 transfer rate. The results showed that UALR not only increased degradation rate, but also was better than the simole sum of degradation by O3 and ultrasound separately. Under the operation conditions of O3 flow of 0.34 m^3·h^-1, ultrasonic intensity 3.71 W.cm^-2, and initial concentration of dimethoate at 20 mg·L^- 1, the degradation rate of dimethoate increased to 80%. UALR seems an advisable choice for treating organic wastewater and this process may have wide application prospect in industry. 相似文献
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以悬浮态TiO2为光催化剂,在紫外光的照射下催化降解乐果,研究了乐果初始浓度、纳米TiO2添加量、反应体系温度、初始pH及通入空气等因素对乐果降解率的影响。结果表明,与反应体系温度和体系初始pH相比,纳米TiO2添加量和乐果初始浓度对乐果降解效果影响较大;不同流速空气通入均能使乐果降解率在0~20 min反应阶段有较大幅度的提高;当纳米TiO2添加量为0.1 g/L,乐果初始浓度为20 mg/L,反应体系温度为30℃,初始pH为6.5的条件下,再辅以空气(2.5 L/min)通入,反应60 min后,乐果降解率可达97.15%。 相似文献
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乐果微污染原水的碱解-活性炭处理研究 总被引:2,自引:0,他引:2
在去除模拟污染源水中乐果的实验室和中试试验中,考察了pH、粉末活性炭投加量对去除效果的影响.结果表明,当原水中乐果的质量浓度为0.095~0.286 mg·L~(-1)、pH为9.5~10时,乐果的去除率都随着粉末活性炭投加量的增加而提高,平均去除率为35.4%~68.3%;采用石灰碱解+粉末炭吸附预处理乐果超标1倍(质量浓度0.2 mg·L~(-1))左右的原水,在混凝沉淀工艺之前调节pH至9.5左右,常规出水的乐果含量可达到GB 5749-2006的要求. 相似文献
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以悬浮态TiO2为光催化剂,在紫外光的照射下催化降解乐果,研究了乐果初始浓度、纳米TiO2添加量、反应体系温度、初始pH及通入空气等因素对乐果降解率的影响。结果表明,与反应体系温度和体系初始pH相比,纳米TiO2添加量和乐果初始浓度对乐果降解效果影响较大;不同流速空气通入均能使乐果降解率在0~20 min反应阶段有较大幅度的提高;当纳米TiO2添加量为0.1 g/L,乐果初始浓度为20 mg/L,反应体系温度为30℃,初始pH为6.5的条件下,再辅以空气(2.5 L/min)通入,反应60 min后,乐果降解率可达97.15%。 相似文献
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Dan Du Shizhen Chen Jie Cai Yuan Tao Haiyang Tu Aidong Zhang 《Electrochimica acta》2008,53(22):6589-6595
Thin film of a molecular imprinted polymer based on electropolymerization method with sensitive and selective binding sites for dimethoate was developed. This film was cast on gold electrode by electrochemical polymerization in solution of o-phenylenediamine and template dimethoate via cyclic voltammetry scans and further deposition of Ag nanoparticles. The surface plasmon resonance and cyclic voltammetric signals were also recorded simultaneously during the electropolymerization, controlling the thickness of the polymer film to be 25 nm. The imprinted film showed high selectivity towards to dimethoate. The recognition between the imprinted sensor and target molecule was observed by measuring the variation amperometric response of the oxidation–reduction probe, K3Fe(CN)6, on electrode. Under the optimal experimental conditions, the peak currents were proportional to the concentrations of dimethoate in two ranges, from 1.0 to 1000 ng mL?1 and from 1.0 to 50 μg mL?1, with the detection limit of 0.5 ng mL?1. Due to the high affinity, selectivity and stability the imprinted sensor provides a simple detection platform for organophosphate compounds. 相似文献