农药作为一种快速高效而经济的防治有害生物的武器，在保障农业丰收和 促进高产优质高效现代化农业的发展发挥着突出的作用，然而绝大多数的农药尤 其是化学农药及其代谢物和杂质存在着对人畜有益生物的毒害和对环境的影响 等问题，为了提高食品安全程度，农药残留的检验手段成了近几十年来科学工作 者研究的重要课题。本实验对分离成分甲氧DDT（依据美国国家环保局的标准 方法【1】采用凝胶色谱分离系统）用Labtech LC600 高效液相色谱仪依据文献【2】 定量测定其回收率，回收率在95%以上。 ———————————————————— [1] 美国国家环保局，METHOD 3640A [2] WAKOPAK WAKOSIL HPLC application, 20000601-1

氨基酸测定常见的方法有：柱前衍生的反相高效液相色谱法[1]、柱后衍生的 离子交换色谱法。衍生方法存在着衍生过程复杂、衍生产物不稳定或者衍生化试 剂对氨基酸检测产生影响等缺点。Labtech 公司开发了直接测定氨基酸含量的方 法，有效地避免了上述矛盾，从而成为一种简单、易用的氨基酸测定方法。

复方丹参片主要功效活血化瘀，理气止痛。用于气滞血瘀所导致的胸痹，症 见胸闷，心前区刺痛。丹参药材为复方丹参片的主要原料之一，早在2000 年版 药典中就已经建立了高效液相色谱法测定复方丹参片中的丹参酮ⅡA， 方法是 以十八烷基硅烷键合硅胶为填充剂，甲醇∶水(80∶20)为流动相，流速为 1.0mL/min，检测波长270nm。我们使用Labtech LC600 高效液相色谱仪进行丹 参酮ⅡA 分析，得到了满意结果。

SOLIS500是一简洁的激光烧蚀固体进样系统，适用于各种类型和大小的样品。无需 对样品大小有限制及样品的分解，就能进行激光烧蚀取样和大块合金的分析。 SOLIS500型固体进样系统专为ICP-OES直接进样分析大块样品而研制。事实 上，任何样品都可以烧蚀进样而无需样品分解。 SOLIS500采用非常稳定的高能量Nd：YAG 1064nm激光器，**功率50mJ/脉冲。 样品放置在客户化设计的样品架上并通过控制键选择烧蚀取样，可以是单点或扫描 取样分析。 可与任何ICP-OES想联机 无需光学观察和复杂的聚焦 精密度和正确度与经典的固体进样技术相当 适用于导电及非导电样品 设置和操作简单、方便 真正的免维护 激光头的稳定性：<1%，在满功率时

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

The US EPA has recently announced that it will begin to regulate em ission of mercury from coal-fired plants, the largest source of hum an-made mercury pollution, generating approximately 43 tons of merc ury each year. Mercury is released not only in stack gasses, but i n plant waste and the coal cleaning process. The EPA will propose f inal regulations on coal-fired power plants by December 15, 2003. Mercury in coal has been traditionally measured by CVAAS (Cold Vapo r Atomic Absorption Spectrophotometry), which is a time and labor c onsuming method that relies on complicated wet chemistry sample pre paration. The DMA-80 Direct Mercury Analyzer from Milestone eliminates the sa mple preparation step, allowing you to completely process your coal samp le in about 10 minutes, instead of the hours needed for traditiona l methods. This rapid testing (which is as accurate, if not more s o, that CVAAS) gives you the answers you need without consuming val uable time and effort. Other benefits include: Process both liquid and solid samples – no matter the matrix you w ill get an accurate total mercury reading. Process coal, coal ash, sludge, etc… 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. Sample the coal deliveries as they come in and the plant waste befo re it goes out. No chemicals are used in the process so no additional toxic wastes are generated. Completely compatible with US EPA Method 7473 and ASTM Method D672 2-01

摘要： 当今社会越来越关注孕妇及其胎儿和小孩食用被汞污染鱼类和水产品的危害性。美 国食品和药物管理局（USFDA）警告人们减少对旗鱼、鲨鱼和金枪鱼的消费。美国 的海洋渔业、美国环保署（USEPA）和美国食品及药物管理局正非常谨慎地监控在 海中和淡水中的鱼类体内的汞含量水平。 可以使用DMA-80直接测汞仪精确而快速地完成对鱼组织、贝类组织、龙虾组织和比 目鱼组织的汞含量的测定。该仪器不需对样品进行湿化学处理或前处理。当若干重 的部分样品放入仪器中，不到10分钟就可以完成分析。直接测定汞含量，采用一体 化的热分解、接触反应转换、融合、和原子吸收光谱测量的分析顺序，EPA 7473方 法描述了该过程，这种方法适合于实验室和野外测量分析。

Mercury has been the center of public attention for sometime now du e its high toxicity. There are many ways dangerous concentrations o f elemental mercury can get into the soil including illegal dumpin g of contaminated wastes, manufacturing effluents, and even the sim ple operation and maintenance of mercury manometers. Testing and removal of mercury contaminated soil is a costly and ti me consuming job. Waiting to find out lab results from each sample batch can take hours. But now it^s possible to get lab quality resu lts on site, and in only a few minutes.

摘要： 当今社会越来越重视大气中的汞污染问题。许多工厂排放大量的汞到工厂所在地。这些汞必须被测定，土地必须得到补救。 可以用直接测汞仪精确而快速地完成对土壤中的汞含量的测定。该仪器不需对样品进行湿化学处理或前处理。当若干重的部分样品放入仪器中，不到5分钟就可以完成分析。直接测定汞含量，采用一体化的热分解、接触反应转换、融合、和原子吸收光谱测量的分析顺序，EPA 7473方法描述了该过程，这种方法适合于实验室和野外测量分析。

摘要：本文对32种不同样品（主要是食品如谷类、奶粉及鱼类等）进行了汞含量的分析测定。本文采用的仪器是由意大利Milestone公司生产的DMA80固液相自动测汞仪。这种仪器不需任何样品消解，即无论固体样品还是液体样品均可在253.65nm处用原子吸收法进行测定。该仪器通常的工作范围是0~2mg/kg，也可以测定0~0.2mg/kg的样品。该测试的准确性可从对标准物质的测定结果上看出，精度可参考不同样品的测定结果。经计算，检测限为0.5μg/kg。 关键词：痕量汞、固体样品、AAS