毛发/头发检测

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岛津企业管理(中国)有限公司 岛津
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珀金埃尔默企业管理(上海)有限公司 PerkinElmer
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头发中汞元素检测方案(测汞仪)

Approximately 2700 – 6000 tons of mercury are released into the at mosphere annually. Once airborne, mercury can travel thousand mile s from its generation point. Eventually, it precipitates onto the l and and water. And once it enters water, mercury is transformed by microorganisms into methylmercury, the most toxic and dangerous for m of mercury. Exposure to high dosage of methylmercury can cause tremors, inabili ty to walk, convulsions and even death. Children exposed to the mercury show a variety of abnormalities such as delayed onset of walking and talking, cerebra l palsy, and slowed neurological reflexes and learning abilities. One of the best indicators of exposure to mercury is testing for co ncentration in hair and blood. The average concentration of mercur y in non-exposed people is about 8 ppb in blood and 2 ppm in hair Mercury has traditionally been measured in hair, blood, tissues, an d urine by CVAAS (Cold Vapor Atomic Absorption Spectrophotometry), which is a time and labor consuming method that relies on complicat ed wet chemistry sample preparation. The DMA-80 Direct Mercury Analyzer from Milestone eliminates the sa mple preparation step, allowing you to rapidly process your samples in m inutes, instead of the hours needed for traditional methods. This r apid testing (which is as accurate, if not more so, that CVAAS) giv es you the answers you need without consuming valuable time and eff ort. Other benefits include: Process both liquid and solid samples – no matter how difficult th e matrix you will get an accurate total mercury reading. The built-in 40-position autosampler allows unattended operation fo r a large number of samples The DMA-80 is portable enough to be stationed where you need it mos t; in your laboratory, in a portable testing van, etc... No chemicals are used in the process so no additional toxic wastes are generated. Completely compatible with US EPA Method 7473
检测样品: 毛发/头发
检测项: 汞元素

北京莱伯泰科仪器股份有限公司

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头发中汞检测方案(测汞仪)

汞是一种剧烈的神经毒素,是威胁人类公共健康的因素之一。元素汞经常是因为采矿或者煤炭的燃烧从而形成汞蒸汽,并长距离的传播,从而污染水源和土壤。虽然汞通常以无机的形式存在,但是它经常可以在厌氧情况下由微生物作用形成毒性更大的甲基汞。甲基汞的毒性往往可以通过食物链的环节在生物体中形成生物积聚和生物放大,从而急剧恶化。 头发中的汞和血液中的汞常被用做人体汞暴露程度评估的生物指标。一般头发中的汞是血液中汞浓度的250倍。与血汞测试比较,头发中的汞测试更为常用,因为汞在头发的生长过程中会累积,更能反应汞暴露的长期性。另一项研究表明,食用鱼肉是被认定为除了汞职业暴露之外的另一主要的甲基汞在人体中积聚的主要原因。基本上有75%-100%的汞在鱼肉中是以甲基汞的形式存在,所以通常食用更多鱼肉的人,头发中汞的含量也越高。 因此作者以中国南方珠江三角洲一带以渔业为生的人群作为研究对象,设计了调查问卷,并对广东省多个地区人群的头发,主要食物如:鱼类,贝类,蔬菜,谷物进行了采样,并进行汞含量的分析。实验中甲基汞的测定用到的是Brooks Rand 生产的MERX全自甲基汞分析系统。 通过实验分析发现,被调查人群头发中总汞和甲基汞的平均含量分别为1.08 ± 0.94 μg g-1 (0.14–7.15)和0.58 ±0.59μg g-1 (0.03–4.64)。进一步的研究表明,影响这些人头发中汞含量的因素主要和被分析人的年龄、饮食习惯以及抽烟习惯有密切关系,其中鱼肉和谷物的摄入是当地居民汞暴露的主要途径。
检测样品: 毛发/头发
检测项:

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