黄铁矿单矿物中痕量硒、碲的测定

本文研究了痕量元素硒和碲在稀盐酸体系中经７３２型阳离子交换树胎的分离行为。经分离后的试液,用催化极谱法分别测定硒和碲。方法具有很高的灵敏度和重现性。硒的最低检测限为０．１ｎｇ／ｍｌ,碲为０．０ｌｎｇ／ｍｌ。测硒、碲的相对标准偏差分别为３．５％和１．５％。方法用于黄铁矿单矿物的分析,结果良好。     

Embrittlement of some metallic glasses by Sb,Se, and Te

Some metallic glasses have been found to embrittle after annealing at low temperatures, much as do some steels. In phosphorus-bearing alloys, phosphorus has been found to segregate during annealing and result in sample embrittlement. The present report describes the effects of the steel-embrittling elements Sb, Se, and Te on metallic glasses in which the primary metallic constituents are Fe and/or Ni. Bend ductility and stress relaxation measurements of as-cast and annealed glassy alloy ribbons have been used to study embrittlement resulting from less than 0.2 at.% Sb, Se, and Te addition to the base alloys. XRD, DSC, and magnetic measurements have been used to further characterize the samples and to check for changes in magnetic properties which may accompany embrittlement. Results show that P is a very weak embrittler compared with Sb, Se, and Te. Furthermore, the embrittling power of these three elements varies in the sequence Te ⩾ Se ⪢ Sb, the same sequence as found in steels. The effect of a given embrittler is enhanced when substituting Fe in place of Ni. No substantial changes in DSC or magnetic measurements have been found as a result of substituting the small amount of embrittler into the base alloys investigated.     

ICP-AES测定锑烟灰中铜、银、硒、碲、砷、铋方法研究

提出了电感耦合等离子体原子发射光谱法同时测定锑烟灰中有价金属及有害元素的方法。用硫酸完全溶解样品,试液中加入酒石酸络合大量锑(ⅴ),盐酸稀释至刻度定容。再移取一定量的试液于100 mL容量瓶中,稀释成20%的盐酸介质在电感耦合等离子体原子发射光谱测定。对光谱仪的工作条件及分析谱线的选择等分析条件作了试验优化。方法的检出限3S为1.2 ug/L(铜),0.08 ug/L(银),4.1 ug/L(硒),3.2 ug/L(碲),3.3 ug/L(砷),4.5 ug/L(铋)。对锑烟灰按所提出的方法分析并以此作基体加入两个不同浓度水平的铜、银、硒、碲、砷、铋标准,进行方法的准确度和精密度试验,测得回收率在95.5%～104.3%,相对标准偏差(n=6)在0.5%～2.0%。     

Thermodynamics of Fe-C-j （j=Al, Si, P, S） Melts

Based on a proposed method, the mathematical expressions between carbon solubility in Fe-C-j (j = Al, Si, P, S) melts and temperature were obtained. The expressions show the relation of the affecting factors of component j and temperature on carbon solubility, and the activity interaction coefficient of j upon carbon depends on atomic number, covalent radius and electro-negativity. The affecting factors of four elements on carbon solubility are all negative. There is a linear relationship between covalent radius and electro-negativity.