OptimalParameters of Response Surface Methodology for Preparation of Magnesium Hydroxide Flame Retardant

The yield of magnesium hydroxide was investigated via response surface methodology using bischofite and aqueous ammonia as raw materials. The experimental results indicated that the effects of reaction temperature, magnesium ion and aqueous ammonia concentrations on the yield of magnesium hydroxide gradually decreased. In particular, reaction temperature and magnesium ion concentration had a significant influence on the yield. After the regression and fitting of the response value and each factor, the regression equation was obtained. As proven by experiments, the predicted value and actual value showed a good fit. The products of the center experiment were characterized by particle size analysis, scanning electron microscopy, and X-ray diffraction. The results show that the morphology is irregular and shows a lamellar structure. The particles have a narrow size distribution ranging from 0.64 to 0.68 mm of D50 size. The difference in particle size of D10 and D90 is less than 0.91 mm, and the purity very high.     

自动静态双接收高精度热电离质谱法测定硼同位素

在以Cs₂BO₂⁺离子进行硼同位素测定时,由于所测定的两种离子¹³³Cs₂¹¹B¹⁶O₂⁺（m/z 309）和¹³³Cs₂¹⁰B¹⁶O₂⁺（m/z 308）具有极小的相对质量差（0.032%）,一般的商业同位素热电离质谱计无法实现对这两种离子的同时全接收。为此,一些学者对某些商业仪器进行了改造或采用zoom技术,基本实现了对硼同位素高精度测定。本实验利用特制的Triton热电离质谱仪,以Cs₂BO₂⁺离子流的自动静态双接收进行硼同位素组成的测定。研究了不同离子流强度和不同带电流对250 ng标准样品NIST 951 H₃BO₃测定值及测试精度的影响,结果表明,当带电流在1 150~1 350 mA之间变化或者离子流稳定在0.1~10 V之间时,标准样品的硼同位素比值在4.052 63 ~ 4.053 38区间变化。导致二者一致的实验现象是由带电流强度造成的,当带电流越高时,产生的离子流相应也越高,因此可以采用相同的带电流控制不同样品的测试值和测试精度。在此基础上通过优化测试条件, 摸索出硼同位素自动测试程序,并用该程序对标准样品及实际样品进行测定,无论是测试结果还是测定精度均能达到手动测试效果,节省了人力,提高了工作效率。     

正热电离质谱法测定硼同位素的研究进展

This article summarizes the followings: the principle of PTIMS, the choice of filament materials, graphite influence, the sequence of graphite loaded, the form of sample loaded, the isobaric interference and the form of ion beam collected. At last an outlook was given for the determination of boron isotopic by negative thermal ionization mass spectrometry.     

古生代珊瑚和腕足化石的成岩蚀变判断方法

About 63 samples of paleozoic brachiopods and coral were collected from Yunnan-Guizhou plateau, China. Its conduct of trace elements, cathodoluminescence, scanning electron microscopy(SEM), boron isotopic composition and other indicators together to judge the diagenetic alteration of sample preservation. The results show that each method has its limitations. The diagenetic alteration of the sample can only be judged by the integrated method.     

新疆富蕴县阿拉散地区稀有金属矿地质特征及矿化规律

新疆富蕴县阿拉散地区集中分布有大量稀有金属,成矿区位于阿尔泰山库尔木图-可可托海稀有金属成矿带中段,区内伟晶岩发育,是稀有金属、白云母、宝石等矿产的集中分布区,属于钽、铍、铌、铷稀有金属多样化矿化区。本文首先对该地区成矿地质背景及地质特征进行分析,随后对地区稀有金属矿化分布规律进行了详细谈谈,并指出了今后稀有金属的勘探和找矿方向。     

TIMS（Triton）测定质量范围的扩展及其在溴同位素测定中的应用

稳定溴同位素可用来识别和评价地下水的来源、成因及其形成的水文地球化学与物理过程。由于热电离质谱仪Triton的加速电压是固定10 kV不可调节的,因此,其最大的测定质量数为310 u。为了测定质量数更高的Cs₂Br⁺（m/z 345,347）离子,本研究通过对热电离质谱仪Triton加速电压单元的改造,成功地将加速电压由10 kV降低到8 kV,使可测定的离子质量数从310 u扩展到350 u。在此基础上,建立了在8 kV加速电压下相应的质量校正曲线,进行了基于¹³³Cs₂⁷⁹Br⁺（m/z 345）和¹³³Cs₂⁸¹Br⁺（m/z 347）离子的稳定溴同位素静态多接收测量。结果表明：当溴含量低于10 μg时,测定结果偏低;当溴含量高于10 μg时,测定结果正常。该方法测定溴同位素具有涂样量少（10~20 μg Br）,测定外精度高（0.09‰~0.18‰）和采集数据时间短（8 min可采集100 个数据）等优点,可为地质样品中溴同位素地球化学的研究提供参考。     

新疆科克塔勒铅锌矿矿床地质特征及找矿标志研究

阿尔泰地区已发现的百余处铅锌矿(点),科克塔勒铅锌矿是新疆目前最大的铅锌矿床,累计提交资源量锌199.37万吨,铅84.59万吨,伴生银1730吨。近年来随着新疆地区矿产资源勘探程度和规模的不断扩大,阿尔泰山系大部分已知矿点都进行了大量勘查和开采,区域内深部找矿及隐伏矿点的勘察和开发成为今后该地区重要的找矿方向。本文在结合区域成矿地质背景和地质特征的基础上,对科克塔勒铅锌矿矿床深部找矿标志和找矿方向进行了分析,为下一步深部找矿提供依据。