等离子体质谱法测定岩石中的铌,钽,锆,铪,钍,铀

应用ＩＣＰ－ＭＳ法测定了岩石中的痕量Ｎｂ、Ｔａ、Ｚｒ、Ｈｆ、Ｔｈ、Ｕ，给出了检出限，并对酸溶和碱熔两种制样方法进行了对比实验。     

Biogenic silicate accumulation in sediments, Jiaozhou Bay

1 INTRODUCTION Silicate, or silicic acid (H4SiO4), is a very im- portant nutrient in the ocean. Unlike other major nu- trients such as phosphate and nitrate or ammonium, which are needed by almost all marine plankton, silicate is an essential chemical req…     

大鹏澳养殖网箱水体的磷酸盐、硅酸盐

根据1998年8月至10月每月一次对大鹏澳海区养殖网箱水体定点26h连续观测，统计了各网箱水体中磷酸盐和硅酸盐的周日变化范围和平均值；分析了磷酸盐和硅酸盐的周日变化特征；讨论了磷酸盐和硅酸盐与环境因子的相互关系；估算了各网箱水体的磷负荷；初步评价了网箱水质的营养状况。     

新生相形成的模拟实验研究

通过模拟实验制备了硅酸盐类不溶性固体，从Ｘ射线衍射特征和红外光谱特征两方面看，制得的硅酸盐类与河口新生相成分，结构相似，表明铁水解成的β－ＦｅＯＯＨ胶体吸附Ｓｉ，Ａｌ，Ｍｇ，Ｋ等元素，经结构重组可形成硅酸盐矿物，这可能是河口体系新生相的形成原因。     

东海沉积物间隙水中硅酸盐和硫酸盐“扩散-平流-反应”模式的研究

本文提出了东海沉积物间隙水中溶解硅酸盐和硫酸盐的“扩散-平流-反应”模式。研究结果表明,由于间隙水受到硅酸盐溶解、吸附和沉淀不同体系的控制,因而间隙水中的硅酸盐具有三种不同形式的垂直分布,并从模式中得到了上述反应的反应常数,其中E柱硅溶解的一级动力学反应常数为0.00l 42a~(-1)。首次发现了东海沉积物间隙水中硅酸盐指数下降的垂直分布规律,并从数学模式上进行了处理。本文还研完了由于有机质还原sO_4~(2-)而产生的硫酸盐指数下降垂直分布,提出其模式,结果表明,SO_4~(2-)还原最大速率发生在沉积物-水界面附近,每年可达lmmo1/dm~3。     

Sulfur Isotope Fractionation in Magmatic Systems：Models of Rayleigh Distillation and Selective Flux

The effect of Rayleigh distillation by outgassing of SO2 and H2S on the isotopic composition of sulfur remaining in silicate melts is quantitatively modelled.A threshold mole fraction of sulfur in sulfide component of the melts is reckoned to be of critical importance in shifting the δ^34S of the melts mith respect to the original magmas.The partial equilibrium fractionation in a magmatic system is evaluated by assuming that a non-equilibrium flux of sulfur occurs between magmatic volatiles and the melts,while an equilibrium fractionation is approached between sulfate and sulfide within the melts.The results show that under high fo2 conditions,the sulfate/sulfide ratio in a melt entds to increase,and the δ^34S value of sulfur in a solidified rock might then be shifted in the positive direction.This may either be due to Rayleigh outgassing in case the mole fraction of sulfide is less than the threshold,or due to a unidirectional increase in δ^34S value of the sulfate with decreaing temperature,Conversely,at low fo2,the sulfate/sulfide ratio tends to decrease and the δ^34S value of total sulfur could be driven in the negative direction,either because of the Rayleigh outgassing in case the mole fraction of sulfide is greater than the threshold,or because of a unidirectional decrease inδ^34S value of the sulfide.To establish isotopic equilibrium between sulfate and sulfide,the HM,QFM or WM buffers in the magmatic system are suggested to provide the redox couple that could simultaneously reduce the sulfate and oxidize the sulfide.CaO present in the silicatte Melts is also called upon to participate in the chemical equilibrium between sulfate and sulfide,Consequently,the δ^34S value of an igneous rock could considerably deviate from that of its original magma due to the influence of oxygen fugacity and temperature at the time of magma solidification.     

温和水热法制备MZr2(PO4)3(M=Na,K,Rb)

在温和的水热条件下分别制备出纯净的磷酸锆钠 [NaZr2 (PO4) 3 ]、磷酸锆钾 [KZr2 (PO4) 3 ]和磷酸锆铷 [RbZr2 (PO4) 3 ]。研究了原料配比、矿化剂 (氟离子 )、反应时间和温度等水热晶化条件对产物生成的影响。发现在较宽的温和水热条件下可以制得这三种磷酸锆盐 ;随着碱金属离子的增大 ,产物的生成条件越来越窄 ;最佳制备条件是 :F- ZrO2 =2、P2 O5 ZrO2 =3 (均为摩尔比 )、[ZrOCl2 ]=0 6mol L、反应温度 1 5 0℃、反应时间 2天。用水热法没有制备出同一系列磷酸锆盐中的磷酸锆锂 [LiZr2 (PO4) 3 ]和磷酸锆铯 [CsZr2 (PO4) 3 ]。采用XRD、SEM、IR、Raman和XPS等现代物化仪器对产物的结构与物相纯度进行了测定与表征     

硅酸盐熔体微结构单元的探讨

为了深入了解熔融硅酸盐的各种性质，综合前人的资料并结合自己的实验结果，对硅酸盐熔体中的微结构单元进行了探讨。熔体中包含5种不同的硅氧四面体(以Qn表示，n为四面体中的桥氧数目)，不同的硅氧键中的电荷分布以及Qn在Raman谱图中的特征位移区有区别，熔态谱和玻璃态谱之间也存在差别，同组成熔体和淬冷玻璃中，同一Qn具有不同的摩尔分数、自由能和无序度，并且熔体中Q4的振动是非Raman活性的。     

5′-硝基水杨基荧光酮与锆显色反应及其应用

在００８～０１０ｍｏｌ／ＬＨＣｌ介质中，溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下，Ｚｒ（Ⅳ）与５′＿硝基水杨基荧光酮（５′＿ＮＳＦ）发生显色反应，形成１∶４的桔红色络合物，λｍａｘ＝５４０ｎｍ，ε为１４６×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，Ｚｒ（Ⅳ）含量在０～０５ｍｇ／Ｌ符合比尔定律。方法用于氧化铝及陶瓷釉料中锆的测定，结果与ＩＣＰ＿ＡＥＳ法相符，ＲＳＤ（ｎ＝５）在１３％～３７％。