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[目的]通过田间药效试验明确30%2,4-滴丁酯·辛酰溴苯腈·烟嘧磺隆OD对玉米田杂草的防治效果、最佳使用剂量及对玉米的安全性。[结果]30%2,4-滴丁酯·辛酰溴苯腈·烟嘧磺隆OD可有效地防除玉米田杂草。适宜的施药时间为玉米3~5叶期,一年生禾本科杂草2~4叶,阔叶杂草2~5 cm时进行茎叶喷雾处理,适宜的施药剂量为420~630 g a.i./hm2。[结论]30%2,4-滴丁酯·辛酰溴苯腈·烟嘧磺隆OD对玉米田禾本科杂草和阔叶杂草有良好的防效,对玉米安全。 相似文献
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《农药》2016,(11)
[目的]建立一种同时测定辛酰溴苯腈、烟嘧磺隆、莠去津的高效液相色谱法。[方法]采用高效液相色谱法,以乙腈和水为流动相,使用ODS C18填充的不锈钢柱和可变紫外检测器,在238 nm波长下对试样中辛酰溴苯腈、烟嘧磺隆、莠去津进行液相色谱分离和定量分析。[结果]辛酰溴苯腈、烟嘧磺隆、莠去津的线性相关系数分别为0.9997、0.9998、0.9997;标准偏差分别为0.085、0.009、0.095;变异系数分别为0.64%、0.28%、0.43%;平均回收率分别为101.42%、100.00%、98.82%。[结论]方法简便、快速,精密度和准确度高,适用于农药制剂产品中辛酰溴苯腈、烟嘧磺隆、莠去津的质量控制。 相似文献
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《农药》2019,(11)
[目的]建立一种30%辛酰溴苯腈·烟嘧磺隆·氯氟吡氧乙酸异辛酯可分散油悬浮剂(OD)的定量分析方法。[方法]采用高效液相色谱法和反相色谱柱,以乙腈和水为流动相(体积比80∶20),以236 nm为检测波长,对试样中烟嘧磺隆、辛酰溴苯腈和氯氟吡氧乙酸异辛酯进行液相色谱分离测定。[结果]辛酰溴苯腈、烟嘧磺隆和氯氟吡氧乙酸异辛酯的线性相关系数分别为0.9997、0.9993、0.9996;标准偏差为0.022、0.012、0.01;变异系数为0.001%、0.002%、0.001%;平均回收率为99.50%、99.42%、99.37%。[结论]该方法具有简便、快速、分离效果好,线性关系良好、精密度和准确度高的特点,可有效用于30%辛·烟·氯氟吡OD的定量分析。 相似文献
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39%辛酰溴苯腈·烟嘧磺隆·莠去津油悬浮剂对夏玉米田杂草的防除效果 总被引:2,自引:0,他引:2
《农药》2015,(5)
[目的]为明确39%辛酰溴苯腈·烟嘧磺隆·莠去津油悬浮剂对玉米田杂草的防除效果及对玉米发育的影响和安全性。[方法]采用茎叶喷雾,定期调查的方法进行田间药效试验。[结果]39%辛酰溴苯腈·烟嘧磺隆·莠去津油悬浮剂的推荐用量为526.5~585 g a.i./hm2,药后35 d对杂草的总体防效可达到99.46%。[结论]39%辛酰溴苯腈·烟嘧磺隆·莠去津油悬浮剂能够有效防除玉米田杂草,并对玉米有较好的安全性。 相似文献
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采用高效液相色谱法,以乙腈和水为流动相(磷酸调制弱酸性液体),使用ZORBAX Eclipse Plus C_8色谱柱和紫外可变波长检测器,在245 nm波长下对20%硝·烟·辛酰溴可分散油悬浮剂进行定量分析。结果表明:硝磺草酮、烟嘧磺隆和辛酰溴苯腈的线性相关系数分别为0.999 7、0.999 7、0.999 6,标准偏差分别为0.064、0.021、0.079,变异系数分别为0.80%、0.53%、0.99%,平均回收率分别为100.18%、100.03%、99.85%。 相似文献
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样品中三环唑质量分数ω(%)采用液相色谱外标法(GB20701–2006)测定。较全面地考虑了整个测定过程可能引入不确定度的因素,根据不确定度评定的数学模型,建立了评定程序和方法,确立了ω标、A标、A样、m标、m样以及溶液配置定容共6个不确定度分量并分别进行评定,最后合成了测量结果ω(%)的标准不确定度和扩展不确定度。评价方法适用于液相色谱外标法测定原药或制剂中三环唑的质量分数。 相似文献
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采用反相高效液相色谱法, 以甲醇∶水= 50∶50( V/ V) 为流动相, 苯乙酮为内标物,测定了3 % 克百威颗粒剂中克百威的含量。该法精密度S = 0 .068 , RSD= 2 .1 % , 回收率为98-2 % ~99 .2 % 。 相似文献
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A. G. Belogrudov V. A. Perepelitsyn L. Ya. Osipova S. M. Zubakov 《Refractories and Industrial Ceramics》1969,10(1-2):58-61
Conclusions Using magnesite powders with large contents of magnesium oxide we obtained high-quality magnesite and periclase-spinel products. Periclase-spinel products obtained from the above powders satisfy the requirements of GOST for the PShSP type of product for the roofs of open-hearth furnaces and electric steel furnaces. Their thermal shock resistance is 7–15 water-heat cycles, compared with 5–7 heat cycles for ordinary periclase-spinel products, which is due to their structural features.Translated from Ogneupory, No. 1, pp. 54–58, January, 1969. 相似文献
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In the present paper, mechanical properties with respect to bending strength and fracture toughness of 99% and 92% Al2O3 at ambient and cryogenic temperatures (293 K, 195 K and 77 K) were measured with four-point bending method and SENB method respectively. It shows that the bending strength of both 99% and 92% Al2O3 seemed not to depend on temperature and with decreasing temperature there was a slight increase in the fracture toughness of 99% Al2O3 at 77 K but that of 92% Al2O3 remained almost unchanged with measurement uncertainties taken into account. It was also discovered that the reduction in the fracture toughness of glass phases in grain boundary had a negative effect on the improvement in that of α-Al2O3, thus the resultant toughness at 77 K appears not to increase as 99% Al2O3 does. On basis of qualitative analysis of phase compositions by XRD, the decrease in temperature down to 77 K did not result in any phase transformation of which the cryogenic mechanical properties are independent. The thermal conductivity of 99% and 92% Al2O3 was 4.1 W/(m K) and 1.7 W/(m K) at 20 K, respectively, much lower than that of stainless steel. Simultaneously alumina, whose thermal expansion is low between 123 K and 170 K, can be stable enough to temperature changes. Alumina ceramics, therefore, can be candidate materials for cryogenic application. 相似文献