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近年来,加拿大卫生部多次对其国内市场中销售的儿童珠宝展开监查,在测试中发现多种儿童珠宝含有有害化学物质,有些几乎完全由镉制成。因此,不久前该国卫生部部长LeonaA~ukkaq提议颁布指引,建议儿童珠宝中总镉的含量不超过总重量的0.013%。 相似文献
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Jian Xun ZHANG Chen Chen LI Zheng CHEN Zhi Hua RAO Da Wei WEN Ke An LI Hu Wei LIU 《中国化学快报》2005,16(12):1633-1636
Metabolism of four tobacco-specific N-nitrosamines (TSNAs), N'-nitrosonornicotine (NNN), N'-nitrosoanatabine (NAT), N'-nitrosoanabasine (NAB) and 4-(methyl nitrosamino)-1- (3-pyridyl)-1-butanone (NNK) was studied by solid-phase extraction (SPE) and liquid chromato- graphy-electrospray ionization-mass spectrometry (LC-ESI-MS). SPE and LC-ESI-MS method was evaluated to be rapid, simple, sensitive and selective for analysis of TSNAs in rabbit serum. The doses of TSNAs administrated were 4.666 μg/kg and 11.665 μg/kg according to different levels in cigarettes. Metabolic curves of four TSNAs and 4-(methyl nitrosamino)-1-(3-pyridyl)- 1-butanone (NNAL), the metabolite of NNK, were obtained. 相似文献
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甲醛是一种具有刺激性气味的无色气体,也是一种潜在的致癌物质,对人体的健康有较大危害。它主要来源于工业制造树脂、人造纤维、胶合板等。因此,甲醛是室内空气污染的主要因素,也是室内空气监测的必测项目。 相似文献
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CHEN Zhi-bo AN Yang WANG Zhe ZHANG Bo-xun LIU Lan-ying 《高等学校化学研究》2007,23(1):76-80
Cigarette smoking is correlated with the development of various cancers. 4- (Methylnitresoamino) -1- (3-pyridyl) - 1-butanone(NNK) is one of the major tobacco-specific carcinogens in the cigarette smoke, which increases the risk of breast cancer. In the present study, it was demonstrated that NNK rapidly activated ERK1 and ERK2 MAP kinases in human normal mammary epithelial cells. It was found that there are two different routes for the activation of ERK1/2 with NNK. One is from nicotinic receptor nAchR to MEK1/2, and the other is from tyrosine kinase containing receptor to MEK1/2. The tobacco-specific carcinogen NNK shows a strong proliferative effect on normal human mammary epithelial cells and cancer mammary epithelial cells. 相似文献
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铬(Ⅵ)可干扰很多重要的酶的活性,损害肝脏和肾脏,是一种潜在的致癌物质,因此测定环境样品中的铬(Ⅵ)具有极其重要的意义。测定铬(Ⅵ)的方法主要有二苯基碳酰二肼分光光度法、原子吸收光谱法、流动注射分析法,而流动注射分析法又分为流动注射原子吸收光谱法、流动注射分光光度法、流动注射化学发光法。 相似文献
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亚硝酸根是一种致癌物质,广泛存在于水、土壤、蔬菜及腌制食品中,进入人体的胃后能与胺反应生成一种致癌物质,在血液中与血红素生成正铁血红蛋白而使血红素失去送氧功能,对人体健康产生危害,因此其分析方法的研究受到高度重视。目前国内常用Griess比色法和现代分析法测定亚硝酸根,但前者使用了有致癌作用的a-萘胺,影响操作人员的身体健康。后者又因使用了较昂贵的仪器设备而不能普及。 相似文献
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