共查询到20条相似文献,搜索用时 62 毫秒
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在实际应用中,磷化铝与二氧化碳混合熏蒸,二氧化碳浓度往往达不到增效浓度,仅能起防燃爆、降温作用.通过实验将磷化铝片剂均匀施放于粮面自然潮解,然后运用环流技术熏蒸.试验结果表明,既达到了磷化铝与二氧化碳混合熏蒸法相同的效果,同时避免了熏蒸毒气浓度起始时间即达到高峰,延长了毒气有效密闭时间;降低了施药人员的劳动强度,节约了防治经费. 相似文献
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磷化铝熏蒸杀虫器主要由反应罐、冷却罐、毒气分流罐、下水控制装置、毒气输送管道等构成。其工作原理为:把磷化铝药剂放在密封的反应罐内,通过下水控制装置缓慢地把水注入反应罐内,与药剂发生反应,生成磷化氢、氨和二氧化碳气体,残渣为氢氧化铝。在一定时间内,反应罐内生成一定浓度的气体通过过滤罐、分流罐和输气管道输送到烟叶仓库的各处,达到熏蒸杀虫的目的。施药量按仓库的实际体积计算,用药量1g/m3可达到全部杀灭害虫的效果 相似文献
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以高大房式仓散存硬麦为实验对象,运用磷化氢环流熏蒸装备,分别采用仓外施药、仓外与粮面施药相结合、仓外与粮面间歇投药法不同方式生产性应用。根据不同区域和厂房条件,可以制定经济、安全、有效的熏蒸工艺,节省熏蒸时间,且浓度均匀,杀虫效果好。 相似文献
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目的建立木耳中磷化铝残留量的顶空-气相色谱检测方法。方法将样品称量于顶空进样瓶中,加入硫酸溶液,使磷化铝与酸反应生成磷化氢,用气相色谱-氮磷检测器检测磷化氢的含量,得到样品中磷化铝的含量。结果磷化铝在0.05~5.00 mg线性关系良好,相关系数0.995,加标回收率在83.4%~112.6%,相对标准偏差为9.4%~10.2%之间,方法检出限为0.02 mg/kg。结论该方法快速简便、灵敏度高、准确性好,满足相关法规的限量要求,可用于木耳中磷化铝含量的实际检测工作。 相似文献
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J.A. Hardin C.L. Jones R.T. Noyes D.A. Eltiste 《Journal of Stored Products Research》2010,46(3):149-154
Research using ozone gas as a fumigant has shown promise in controlling stored-grain insect pests. In addition to being toxic to insects, ozone gas is unstable and decays naturally into diatomic oxygen and must be continually replenished to maintain entomologically lethal concentrations in the grain mass. This two-part study quantifies the rate of ozone gas decay encountered in typical grain storage environments. From this, ozone generation capacity can be modeled. A pilot study was conducted in a commercial steel grain bin filled with 13.6 tonnes of hard red winter wheat. The bin was equipped with a closed-loop recirculation system to capture and reuse ozone gas that had passed through the grain. A second laboratory study was conducted on 55 kg samples of wheat and corn to determine the rate of ozone decay in different grains at different fumigation temperatures. With previously untreated grain samples, initial ozone decay is high. After a passivation period that ranged from 53.5 to 84.7 h, the decay rate reached a steady state. The half-life of ozone ranged from 122 s in grade 4 wheat with high foreign matter content, to 242 s in grade 2 wheat. Results show that the rate of ozone decay in wheat and corn was not significantly affected by temperature in the range in which fumigations are typically undertaken. 相似文献
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Development of natural dyed jute fabric with improved colour yield and UV protection characteristics
Premordanting of jute fabric was carried out following single mordanting by biomordants (myrobolan and pomegranate) and ecofriendly chemical mordants (ferrous sulphate and potash alum) and double mordanting by sequential treatment of biomordant and ecofriendly chemical mordant. Extraction condition of natural dyes from manjistha, annatto, ratanjot and babool was standardised and applied on premordanted jute fabric. There is a substantial improvement of colour yield, levelness of dyeing and wash fastness properties of natural dyed jute fabric after double premordanting using bio and chemical mordant. Light fastness ratings are moderate to good while rubbing fastness are very good to excellent for all the natural dyed jute fabric. Very good ultraviolet (UV) protection ratings are achieved in case of dyeing of jute fabric using natural dyes extracted from manjistha, annatto, ratanjot and babool after premordanting with sequential treatment of biomordant and chemical mordant. UV protection properties of natural dyed jute fabric follows the order babool?>?annatto?>?manjistha?>?ratanjot. 相似文献