SOME REFLECTIONS CONCERNING VALENCE VARIATION AND ATOMIC STRUCTURE

In bringing to a conclusion these few scattered reflections concerning valence variation and atomic structure, may I be permitted to say this: He who is experimentally inclined may henceforth take heart and he need not be quite so timid in interpreting strange chemical reactions on the assumption of possible anomaly in the valence of the reactants. The physicist has no hesitation in speaking of the temporary existence, at the higher temperature employed in spectroscopic work, of such molecules as BaCl, AlO, (HO), CH(+), CH(2), MgF, etc. Is it not possible that under the influence of surface forces somewhat similar valence variation may not be excluded even at lower temperatures? That these strange compounds are thermodynamically unstable may be true. Nevertheless, they may function as the mysterious catalysts, or as initiators of chain reactions.     

粮食、土壤中微量砷的测定——氢化物无色散原子荧光分析法

本文采用氢化物无色散原子荧光法测定粮食和土壤中微量砷含量。实验中选择了测试时的最佳条件,包括介质酸度、还原剂KBH_4的浓度和流速、载气流量、原子化温度等。通过对标准溶液和统一参考样品的测定以及工作曲线线性关系的测试,表明方法的精密度高。通过回收率试验,证明方法的准确度好。我们对太湖地区糙米和小麦样品做了大量分析,证明该方法简单、快速、灵敏、准确、干扰少、线性范围宽,特别对测定粮食中微量砷是十分有效的。     

应用原子吸收分光光度法测定山羊瘤胃液、血清钙和镁

本文报告应用国产WFX—1A型原子吸收分光光度计测定山羊瘤胃液和血清的钙和镁,并进行实验讨论。血液钙的变异系数和回收率分别为0.67%知102%,镁的变异系数和回收率分别为0.55%和104%。实验结果与常规法比较差异不显著(P>0.05)。