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采用恒温测试箱法采集汽车内部装饰材料释放的挥发性有机物,利用Nutech预浓缩仪对样品进行三级VOC富集,然后用GC-MS法(气相色谱-质谱法)对汽车内部装饰材料释放的挥发性有机物苯、甲苯、二甲苯、乙苯、苯乙烯进行了测定,检出限低于2.0μg/m3。实验选择皮革表皮、橡胶密封条、灰色无纺布、海棉和仪表盘五种汽车内部装饰材料,进行挥发性有机物含量的测定,并对结果进行了分析和讨论。结果表明五种汽车内部装饰材料均不同程度地释放挥发性有机物,其中热塑性材料仪表盘释放出的TVOC含量最高,橡胶密封条的TVOC释放量也较高,皮革表皮和灰色无纺布释放的甲苯较多,而消音材料海绵主要释放出二甲苯。汽车内部装饰材料释放挥发性有机物的情况复杂,因此,探索和建立有效的汽车内部装饰材料有害物质检测方法,对于选择低毒环保的汽车内部装饰材料非常有意义。 相似文献
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Donati C Benelli B Consonni N Fabregant M Mantyla T Carelli G Corradetti R Snidero S Scarinzi C Morra B Gregori D 《Journal of Safety Research》2007,38(5):589-596
INTRODUCTION: Food Products Containing Inedibles (FPCIs) are believed to represent a source of higher choking risk in children. The aim of this study was to set up a controlled study, conducted on children aged 3-6 in a laboratory setting, in order to understand their behavior when interacting with FPCIs (with reference to mouthing activities, double nature recognition, and toy assembling ability). METHOD: The experimental phase was divided into two sessions: a FPCI session and a Toy session, to which 247 children were randomly assigned. During these sessions children were observed in order to catch their mouthing activity according to the two types of objects available to them (FPCIs and Toys). RESULTS: This study shows that: (a) children's behavior with respect to toys contained in FPCIs and toys presented alone is not significantly different; (b) children's ability to distinguish between the edible and non-edible part of the FPCI was very high; and (c) mouthing episodes of the inedible parts were negligible and comparable between FPCIs and toys presented alone. This strongly suggests that, with respect to choking risk, FPCIs are not per se distinguishable from toys containing small parts. IMPACT ON INDUSTRY: Restrictions on the sale of FPCIs with small toys exist in the U.S. market. In Europe, FPCIs are allowed to be on sale, under the condition that, in case, they will follow the general regulatory requirements of small toys packaged and sold alone. In this case, they must provide age warnings and labels. Our findings do not justify the different attention that toys in FPCIs are at times afforded by regulators when compared to "stand alone" toys. 相似文献
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针对美术颜料生产过程中产生的废水特点,通过实验研究,有针对性地开发出美术颜料废水治理技术,并在示范工程中得到应用,进一步验证了此项技术的可行性。 相似文献
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实际工作中 ,常常会发现有的弯曲件经模具弯曲后的实际尺寸与预先计算的展开料尺寸有较大偏差。针对这一问题 ,从中性层弯曲半径的计算公式及中性层的位移、几种弯曲工艺方案的比较和不同弯曲模具结构的选择等方面 ,分析了造成这种偏差、影响弯曲件展开料尺寸计算准确性的几个因素 相似文献
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