二氧化硅中汞检测方案(测汞仪)

智能文字提取功能测试中

PAGE 1 Application Note APPN-MA-3000-MINERAL-004 Total Mercury in Silica Using Direct Mercury Analysis BACKGROUND Silicon dioxide， also known as silica， is a chemical compound that is an oxide of silicon (SiO，). Known since ancient times， silica is mostcommonly found in nature as quartz， as well as in various living organisms. In many parts of the world， silica is the major constituent of sand.Sio， has a number of distinct crystalline forms (polymorphs)in addition to amorphous forms. Even though it is poorly soluble， silica occurswidely in many plants. Silica is a common additive in the production of foods， where it is used primarily as a flow agent in powdered foods，or to adsorb water in hygroscopic applications. Colloidal silica is also used as a wine， beer， and juice fining agent. In pharmaceuticalproducts， silica aids powder flow when tablets are formed. Silica mining and production can be contaminated with naturally occurring formsof mercury found in the abiotic environment， including： metallic mercury， mercuric sulfide， and the salts mercuric chloride and mercurouschloride. As mercury is known to bioaccumulate in humans， so bioaccumulation from multiple food or pharmaceutical sources can resultin mercury poisoning. Mercury is dangerous to both natural ecosystems and humans because it is highly toxic， especially due to its abilityto damage the central nervous system. Mercury poses a particular threat to human development in utero and in early childhood. Thus， toprevent mercury poisoning， it is necessary to accurately quantify total mercury in silica. REFERENCES · WHO HP： http：//www.who.int/ipcs/assessment/public_health/mercury/en/ ·National Institute for Minamata Disease HP： http：//www.nimd.go.jp/archives/english/tenji/e_corner/etop.html ·Wiki： https：//en.wikipedia.org/wiki/Silicon_dioxide INSTRUMENT NIC MA-3000 is a dedicated direct mercury analyzer that selectively measures total mercury bythermal decomposition， gold amalgamation and cold vapor atomic absorption spectroscopy， onvirtually any sample matrix-solid， liquid， and gas. The MA-3000 offers quick results without anytedious，time-consuming and elaborate sample preparation process. It is a perfect solution totoday's increasing laboratory demand for easy， fast and accurate mercury measurements. MA-3000直接燃烧法在地矿行业测定硅矿中总汞的应用二氧化硅，也称为二氧化硅，是一种化合物，是硅 (SiO2) 的氧化物。自古以来，二氧化硅就以石英的形式在自然界以及各种生物体中最为常见。在世界许多地方，二氧化硅是沙子的主要成分。除了无定形形式之外，SiO2 还具有许多不同的结晶形式（多晶型物）。尽管它溶解性差，但二氧化硅广泛存在于许多植物中。二氧化硅是食品生产中的常见添加剂，主要用作粉状食品中的流动剂，或在吸湿应用中吸附水分。胶体二氧化硅还用作葡萄酒、啤酒和果汁澄清剂。在医药产品中，二氧化硅在形成片剂时有助于粉末流动。二氧化硅的开采和生产可能会受到非生物环境中天然存在形式的汞的污染，包括：金属汞、硫化汞以及氯化汞和氯化亚汞的盐类。众所周知，汞会在人体中进行生物积累，因此多种食物或药物来源的生物积累会导致汞中毒。汞对自然生态系统和人类都是危险的，因为它具有剧毒，特别是因为它能够破坏中枢神经系统。汞对子宫内和儿童早期的人类发展构成特别威胁。因此，为了防止汞中毒，有必要准确量化二氧化硅中的总汞含量。 NIC公司 MA-3000是一款专用的直接汞分析仪，通过热分解、金汞齐化和冷原子吸收光谱有选择地测量几乎任何样品基质(固体、液体和气体)的总汞。MA-3000提供快速测试的结果，没有任何繁琐、耗时和复杂的样品制备过程。这是一个理想的解决方案，以满足当今实验室对简单，快速和准确的汞测量的需求。