ICP-AES法测定煤中硫含量的不确定性评定

[目的]为准确表示煤炭中硫含量奠定基础。[方法]应用电感耦合等离子体发射光谱仪(ICP-AES),对煤中的硫含量进行测定,同时对测量结果的不确定度进行评价。[结果]获得各个不同来源的不确定度,并且计算合成标准不确定度,对测定结果给出合理的波动范围。[结论]评价结果对测定方法有效性的判定与优化以及煤燃烧过程中的污染控制具有重要意义。

电感耦合等离子体原子发射光谱法(ICP-AES)测定磷生铁中的Mn、P、Si

建立了电感耦合等离子体原子发射光谱（ICP-AES）法测定磷生铁中3种元素Mn、P、Si的定量分析方法.通过试验选择257.610nm、185.942nm、212.412nm分别作为Mn、P、Si的分析谱线,无需进行光谱干扰校正.实验结果表明,各元素分析谱线线性相关系数大于0.9990.方法用于高磷铸铁标准物质分析,测定值与认定值相符,测定结果的相对标准偏差在0.21％ （Mn） ～1.8％ （P）范围.

Compound Ceramic Coatings Grown by Micro-plasma Oxidation on Ti-6Al-4V Alloy

Compound ceramics coatings on the Ti-6Al-4V alloy were prepared by the direct current micro-plasma oxidation （MPO） in NaAlO2 solution. The composition and morphology of the coatings were studied with the X-ray diffraction （XRD） and the scanning electron microscopy （SEM）, respectively. Inductively coupled plasma atomic emission spectrometer technique was used to analyze the solution features of Ti-6Al-4V alloy in the process of preparation. The results reveal that Al2TiO5 forms in the coatings at the initial stages of MPO reaction, and its content changes rapidly with the reaction continuing： after 20 min, the ceramics coatings are composed of α-Al2O3, 7-Al2O3 and Al2TiO5, but after 40 min, its main composition is of α-Al2O3. The content of Ti in the solution will increase when the MPO time extends, and as will Al in the anode area until, after 30 min, it reaches the maximum and keeps constant from then on. Both substrata of Ti and Al in the electrolyte join the MPO reaction at the initial stage, where the formation of Al2TiO5 happens; but as the MPO reaction prolongs, more and more Al in the electrolyte will take part in the reaction, leading to the appearance of a large amount ofAl2O3.

电感耦合等离子体原子发射全谱直读光谱仪测定地质样品中的钽

采用电感耦合等离子体原子发射全谱直读光谱仪,以HF-HNO3-HClO4-HCl溶样,不经分离富集,直接测定地质样品(岩石、水系沉积物、土壤)中Ta。方法检出限可达0. 8μg/g。通过国家一级标准物质测试和其他样品以不同方法测定相比较,测定结果基本一致;GBW 07309标准物质6次测定的相对标准偏差(RSD)为12. 0%。