对—甲氧基苯丙烯腈气相色谱分析

使用１０％ＳＥ－３０为固定液的２ｍ长填充柱，以硝基七为内标物，对对－甲氧基苯丙烯腈进行快速，、准确的气相色谱定量分析。其线性相关系数为０．９９９２，回收率达９８－１０２％，平行测定的标准偏差为０．２５－０．２８％，变异系数为０．２９－０．３１％。     

硫化二硫化磷酸钼的合成及其性能的研究

研究了硫化氢对合成硫化二硫代磷酸钼（Ｓ－ＭｏＤＴＰ）的产率、产物钼含量及其润滑特性的影响。结果表明，硫化氢可提高合成Ｓ－ＭｏＤＴＰ产率１．０－２０．０％，增中其钼含量０．４－１．３％。只要０．５％Ｓ－ＭｏＤＴＰ的添加量，即可能使润滑油的摩擦系数降低５４．８％，其磨斑直径减少６０．８％。     

涤纶短纤维油剂对可纺性的影响

对７种进口油剂的可纺性能进行了比较。其中Ｄ－３３７／Ｄ－６２３，Ｃ－１００／Ｃ－１１０，Ｅ－５０２／Ｅ－６０２的可纺性较优。并以Ｄ－３３７／Ｄ－６２３为例，着重探讨了油剂性能、组分比、含油率对涤纶短纤维可纺性的影响，提出了表征纤维可纺性的几项具体指标。即上油率（ＯＰＵ）（０．１２％）一定时，Ｄ－３３７／Ｄ－６２３在３０／７０～６０／４０、Ｆ／Ｆμｓ在０．３３～０．３６时，可纺性较好；Ｄ３３７为０．０５％时，短纤维最终上油率应控制在０．１０％～０．１６％，方能保证短纤维的可纺性。     

供求关系明显好转 市场价格继续走高：3月份橡胶市场综述

２月份价格有调整。品种产量同比，％进口量同比，％新增资源同比，％合成橡胶９．８３２１．１７．９２１．５１７．７３２１．３天然橡胶０．３７．０－１８．６７．３－１８．０表１３月份橡胶新增资源统计表万吨表２２００２年３月橡胶平均价格升降情况元／吨品种价格比上月，％同比，％天然橡胶７６４０２．４－６．０进口３＃烟胶片７６２４２．３－６．０国产１＃标准胶７６５７２．４－６．１合成橡胶丁苯胶（袋装）６８６８３．４－１６．９丁腈胶（袋装）１３５９４－０．５－１．０顺丁胶（袋装）６５９５０．７－１３．４氯丁胶…     

聚氧乙烯蓖麻油的合成

本文用蓖麻油与环氧乙烷为原料，采用气液循环方式进行加成反应，制得系列聚氧乙烯蓖麻油，催化剂／蓖麻油比率为０．６％－０．９％，反应温度为１６０℃－１９０℃，反应压力在０．２－０．２５ＭＰａ，副产物聚乙二醇含量为２％－８％。     

2—乙基—6—甲基—N—（1‘—甲氧基—2’—甲氧乙基）苯胺的气相色谱分析

本文用气相色谱法对２－乙基－６－甲基－Ｎ－（１’－甲氧基－２’－甲氧乙基）苯胺进行定量分析。这种方法简单，快速，准确和实用，标准偏差为０．１１，变异系数为０．１１％，回收率为９９．２８￣１００．６１％。     

嘧磺隆的高效液相色谱分析

采用高效液相色谱法，以Ｃ１８柱为分离柱，以甲醇－水－乙酸含０．０１ｍｏｌ．ｌ＾－１醋酸铵为流动相，内标法测定嘧磺隆的含是，９次测定结果，其平均值为８９．１４％，标准偏差为０．３９％，变异系数为０．５４％，回收率为９９．６％－１０１．４％。     

提高陶陶瓷辊棒使用寿命的体会

为了评价加拿大西部１９１０－１９８６年间发放的春大麦品种的产量进展以及组份和农艺性以产量所起的作用，于１９８－１９９０年在Ｂｏｔｈａ，ｌａｃｏｍｂｅ．Ｏｌｄｓ三个地点对２０个六棱和二棱栽培品种进行了试验。结果表明，籽粒产量每年增加１２．７－４１．４ｋｇ／ｈｍ＾２，收获指数每年增加０．０８％－０．１７％，倒伏每年．０１－０．０５％，种子蛋白质含量每年减少０．０１－０．０２ｇ／ｋｇ。     

薄层层析—荧光光谱法测定柑桔中赤霉素残留量

本文研究硅胶Ｇ为吸附载体的薄层层析－荧光光谱法，用于测定柑桔中赤霉素残留量。采用添加回收的方法，在柑桔样品中添加０．０３、０．１０和０．２０毫克／公斤三个水平，相对标准偏差分别为１７．７、１１．０和８．０；回收率分别为７１．０－１１７．３％、８０．９－１０７．１％和８２．５－１０３．５％。     

乙腈对LLDPE催化剂活性影响的考察

用ＢＰＺ－Ｎ催化剂研究了共聚单体１－丁烯中乙腈含量分别为０，０．０００３５％（Ｖ），０．０００６９％（Ｖ），０．００１２３％（Ｖ），０．００１７６％（Ｖ）时对乙烯与１－丁烯共聚活性的影响。结果表明：当乙腈含量在０．０００３５％（Ｖ）以上时，随乙腈含量的增加，催化剂活性呈直线下降趋势，当达到０．００１７６％（Ｖ）时，活性保有率已不足不含乙腈时的５０％。     

6种复配除草剂防除麦田阔叶草猪殃殃的药效及安全性评价

选用6种复配除草剂和3种单剂,在以猪殃殃占阔叶杂草90%以上的麦田进行田间药效试验。结果为10%苄嘧磺隆·唑草酮WP处理的防效最好,药后45 d猪殃殃的株数和鲜重分别减少92.5%和98.91%,其次为45%苄嘧磺隆·乙羧氟草醚WP处理,株数和鲜重分别减少89.16%和92.52%,其他各药剂处理的防效在87.57%～89.62%,也有较好的除草效果。药后4 d仅苄嘧磺隆·唑草酮处理区麦叶有零星轻微白斑,其他各药剂处理区小麦安全。各药剂对麦田阔叶杂草猪殃殃均有好的防效,除草活性高。具有触杀作用的除草剂和内吸作用的除草剂配伍有好的增效作用。     

30%异丙甲草胺水乳剂的气相色谱分析

采用气相色谱法分析30%异丙甲草胺水乳剂,选用HP–5非极性柱和FID检测器,正二十二烷为内标物,以内标法对有效成分进行分析和定量。异丙甲草胺与内标物的色谱峰能够很好分离,且保留时间适宜,方法的相关系数为0.9988,标准偏差为0.1383,变异系数为0.46%,平均回收率为99.42%。     

15％苄嘧·丙草胺泡腾片剂的研制及其药效试验

通过对原药及多种农药助剂和填料筛选试验和田间药效试验,从众多的助剂中筛选出15％苄嘧·丙草胺泡腾片剂的最佳配方,其配方为:苄嘧磺隆2％,丙草胺13％,润湿剂2.5％,分散剂4％,柠檬酸14.5％,碳酸氢钠16.5％,乳糖6％,硬脂酸镁2％,填料[m(白炭黑)∶m(膨润土)=1∶1]补充至100％.田间药效试验结果表明,...     

Preparation of Berberine-montmorillonite-metolachlor formulations from hydrophobic/hydrophilic mixtures

Metolachlor which is a pre-emergent hydrophobic herbicide with moderate solubility, was detected in several water wells in agricultural and even urban areas. This study aims for the preparation of organoclay platforms which could release metolachlor in a more controlled pattern, thus — reducing the leaching to groundwater. The adsorption of metolachlor to organoclays based on difenzoquat, diquat or berberine added up to neutralizing the original charge of the clay mineral was tested. The adsorption loadings of metolachlor on berberine-montmorillonite were found to be more than 30% of the compound, whereas for difenzoquat- and diquat-montmorillonite the amounts were only 3.8% and 4.9%, respectively. Consequently, further experiments were conducted focusing on berberine-montmorillonite. Loading of preadsorbed berberine was crucial to the hydrophobicity of the platforms and it had also influence on the adsorption of metolachlor in mixed immiscible phases experiments. The exact procedure of preparation was also a key issue on determining final metolachlor amounts on the formulation: Preparation of the formulation from suspended organoclay which was not dried after preadsorbing the berberine, and was mixed with metolachlor dissolved in chloroform gave the highest percentages of adsorbed herbicide. Release from organoclay formulation was at a more controlled fashion than for commercial herbicide, or commercial herbicide mixed with non-modified montmorillonite, leaving a relatively constant concentration of herbicide after several desorption cycles.     

HPLC测定水稻田土壤中苄嘧磺隆的残留量

建立了利用高效液相色谱法测定稻田土壤中苄嘧磺隆残留量的方法。样品以乙腈提取,用配有紫外检测器的液相色谱仪测定。苄嘧磺隆的最低检测量为0.5×10-9g。当添加浓度在0.02～2mg/kg时,添加回收率在85.6%～102.7%,变异系数在4.78%～10.8%,符合测定要求。     

36%苄·二氯可湿性粉剂在土壤中的残留动态

研究36%苄·二氯可湿性粉剂在水稻苗床土壤中的残留动态,建立了样品前处理方法和分析方法.36%苄·二氯WP在稻田土壤样品的添加回收率均大于80%,在吉林省和湖南省土壤中,苄嘧磺隆的半衰期分别为2.59～2.97、1.52～1.59 d,二氯喹啉酸的半衰期分别为10.00～12.49、3.65～4.19 d,降解较快.苄嘧磺隆、二氯喹啉酸在水稻移栽前苗床土壤中均未检出.     

50%异甲·特丁净乳油防除花生田杂草的效果

为明确50%异甲·特丁净乳油在花生田的应用前景,采用田间小区试验、取样考种的方法,观察了其对花生田主要杂草的控制作用和对花生产量的影响。结果表明,50%异甲·特丁净乳油对花生田马唐、牛筋草、反枝苋、马齿苋等多种一年生杂草均有好的防除效果,随用药量的增加防效逐渐提高,药后40d株防效在85%以上,鲜重防效在90%以上,好于异丙甲草胺、特丁净两药剂单用常规剂量处理的防效,显著提高了花生的产量。     

西瓜田化学除草技术探讨

７２％异珍甲草胺乳油７０毫升，４８％氟乐灵服油３０毫升混土，无论在单膜覆盖，双膜覆盖工露地条件下，均有很好的防除效果。株防产分别为９５．９，９３．２％，鲜重防效为９７．５％，９５．２％，对西瓜安全。西瓜对除草剂反应敏感，必须慎用。     

Effects of the herbicides butachlor and bensulfuron-methyl on N2O emissions from a dry-seeded rice field

Independent field and laboratory incubation experiments were conducted to investigate the effects of two commonly used herbicides butachlor and bensulfuron-methyl on N₂O emissions from a dry-seeded rice field. Three treatments were applied in field experiments: a fertilized control without herbicide, fertilized plots amended with butachlor equivalent to 2.55 L ha^?1 of 60 % by weight active ingredient and fertilized plots amended with bensulfuron-methyl equivalent to 300 g ha^?1 of 10 % by weight active ingredient. Herbicides were applied twice in the rice growing season according to local farming practices. The same treatments were used in laboratory incubation experiments, i.e., a fertilized control without herbicide and fertilized soil amended with the herbicide butachlor or bensulfuron-methyl. The soil moisture was adjusted to 0.55 g g^?1 in the lab incubation experiments based on the average water content determined in the dry-seeded rice field. The field and laboratory simulation experiments all showed that the butachlor applications led to significantly increased N₂O emissions (p < 0.05), whereas bensulfuron-methyl had no effect on N₂O emissions (p > 0.05). Butachlor enhanced the N₂O emissions by up to 177.5 % over the entire rice growing season. Moreover, butachlor and bensulfuron-methyl treatment led to a marginal stimulation of the soil respiration rates. A further investigation in the field experiments suggested that the butachlor-enhanced N₂O emissions resulted from increased soil ammonium nitrogen and nitrate nitrogen contents and the more abundance of ammonia-oxidizing and denitrifying bacteria in the late stage after the herbicide application. The bensulfuron-methyl treatment had no influence on N₂O emissions during the rice growing season, which was attributed to the low soil nitrate nitrogen contents during this period.     

机插秧田杂草防除试验研究

2013年进行了机插秧田杂草防除试验研究。结果表明:55%吡嘧·丙草胺WP 1125.0 g/hm2封闭效果最理想,药后20,45 d,封闭综合防效分别为93.75%、92.63%,与55%吡嘧·丙草胺WP 750.0~937.5 g/hm2的防效54.38%~75.00%、51.48%~72.88%及对照药剂50%苄·丁·异丙隆WP 1200.0 g/hm2、53%苄嘧·苯噻酰WP 1200.0 g/hm2的防效76.87%~87.50%、72.07%~85.31%差异极显著。在试验剂量条件下,药剂对水稻安全。