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911柔性生物制片透明脱蜡剂在石蜡制片中的应用 总被引:3,自引:0,他引:3
二甲苯作为传统的透明脱蜡溶剂,被长期广泛应用于常规石蜡制片中,然而,二甲苯是一种毒性较大的试剂,国家有关部门规定室内空气中二甲苯最高允许浓度为100mg/m^3,而在一般病理技术室的二甲苯室内空气往往长远超标,二甲苯对人体的毒害主要通过呼吸道和皮肤接触进人体内,主要损害神经系统, 相似文献
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测定化合物的分配系数有三种方法:摇瓶法、产生柱法、高压液相色谱法.采用摇瓶法测定了萘、甲苯、二甲苯的溶解度,同时测定了辛醇水分配系数和萘、甲苯的土壤的水分配系数.这种方法优点是测定速度快,数据较合理. 相似文献
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使用气相色谱法,选择硝基苯作为内标物,得到了二甲苯溶剂中四种主要成分邻二甲苯、间二甲苯、对二甲苯和乙基苯的线性回归方程。对含该四组分的三组人工配制样品进行回收率测定实验,测得邻二甲苯、间二甲苯与对二甲苯总量以及乙基苯的回收率在91.8%-103.8%之间。利用上述气相色谱内标法对三种市售二甲苯溶剂进行了浓度测定。 相似文献
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如今,很多中小学生的铅笔盒里已不放橡皮,取而代之的是涂改液。殊不知,作为一种化学合成物,涂改液含有二甲苯等化学物质。其中,二甲苯可对肝脏、肾脏造成长期的慢性损害。 相似文献
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The Bacillus firmus was immobilized into Ca-alginate beads according to the different initial biomass concentration, calcification time and activation time.Three types of immobilized Bacillus firmus beads were packed respectively in trickling biofilter to purify xylene contained waste gases,and the performance of immobilized-cell biofilter was compared with traditional biofilm attached biofilter packed with two types of ceramic pellets.The results showed that three types of immobilized beads had different capabilities for removing xylene and life-spans.Higher initial biomass in immobilized beads resulted in better performance but shorter life-span.Activation process can remarkably enhance the activity of bacteria,and the removal efficiency of xylene can substantially be improved.Calcification time had influence on life-span of immobilized beads.Without acclimation,the cell-entrapped biofilter can obtain the maximum elimination capacity of 92.4 g/(m~3·h).However,compared with biofilm attached biofilter,it has a poorer intrinsic drawback in volatile organic compounds (VOCs) removal due to the existence of excess mass transfer resistance. 相似文献