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可用于人体微量元素检测的方法有:同位素稀释质谱法、分子光谱法、原子发射光谱法、原子吸收光谱法、 X 射线荧光光谱分析法、中子活化分析法、生化法、 挥发油又称精油,英文为 essential oils,是存在于植物中的一类具有芳香气味、可随水蒸气蒸馏出来而又与水不相混溶的挥发性油状成分的总称。挥发油为一混 能够检测各类有机及无机固体、液体、气体等样品中含水率的的仪器叫做水分测定仪,按测定原理可以分类物理测定法和化学测定法两大类。物理测定法常用 转子过电压保护装置又称作跨接器,其作为大型发电机转子主保护,还承担着灭磁的作用,正确、安全地对该装置进行定期检验是发电机正常工作的前提。 磁导率μ等于磁介质中磁感应强度B的微分与磁场强度H的微分之比,即μ=dB / dH。通常使用的是磁介质的相对磁导率μr,其定义为磁导率μ与真空磁导率μ0 氨氮测定仪依测试标准的不同,有A、B类型。其中A型采用纳氏试剂比色法GB7479-87;B型采用国标GB7148-81及国际ISO7150/1-1948所规范的水杨酸光度法为基本测试手段,辅以样品比色 |
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