一种新试剂在岩石钍含量测定中的应用

CPA-pB 是一种新的高灵敏钍显色剂。作者采用试剂测定岩石申钍的含量,用分光光度法进行了试验研究。各种条件试验结果表明,该试剂水溶液性能稳定,试剂与微量钍可形成稳定的络合物,而且具有显色速度快、反应灵敏、选择性好等优点。采用此试剂进行岩石钍含量测定时,样品中的干扰元素用离子交换树脂进行分离,以分光光度测定可以得到满意的结果。     

Spatial and temporal variations in free polyamine distributions in Uranouchi Inlet, Japan

Polyamines are an essential component of living organisms that influence normal cell growth and development. Despite the possible importance of polyamines for marine microbial ecology, concentrations of polyamines in seawater are not well known.Using HPLC analysis with a cation exchange column and OPA reagent, we determined polyamine concentrations in seawater without carrying out desalting, concentration or derivatization steps prior to chromatography.In seawater collected from Uranouchi Inlet, putrescine and spermidine were the predominant polyamines, ranging from undetectable (N.D.) to 4.4 nM and N.D. to 2.8 nM, respectively. Though other polyamines were detected, the frequency of detection was much lower than that of putrescine and spermidine; concentrations ranged from N.D. to 0.9 nM for cadaverine, and N.D. to 3.2 nM for norspermidine. Norspermine and spermine were detected in only a few samples; their concentrations varied from N.D. to 3.2 nM and N.D. to 0.5 nM, respectively. These concentrations were higher in the summer.     

粘土对丙烯基复合吸水树脂性能的影响研究

以丙烯酰胺(AM)、丙NN(AA)为原料，以不同粒径的粘士(MMT)为无机填料采用水溶液聚合法合成了复合吸水树脂，讨论了MMT对其吸水性、保水性、韧性、抗温性、抗盐性的影响及其影响机理。结果表明，MMT的粒径越小，吸水树脂吸水倍率越低，韧性、抗盐性、抗温性等性能就越好；可通过调整MMT粒径来提高树脂的综合性能。     

流速对D403型树脂从盐湖卤水中提取硼酸的影响研究

针对流速对D403型苯乙烯系多羟基类弱碱性硼特效离子交换树脂从盐湖卤水中提取硼酸的影响进行了研究,讨论了这种树脂对硼的吸附量与卤水流速的关系。     

利用选择性特效树脂富集分离岩石样品中的锶钐和钕

使用目前国际上几种常用的特效树脂:锶树脂(SR)、稀土树脂(RE)和镧系树脂(LN)对岩石样品中Sr、Sm和Nd的分离富集效果进行了试验,结果表明,按厂家提供的流程,SR树脂可回收98%左右的Sr,而且残余的Rb不到2%;RE树脂回收的Sm和Nd只有70%左右;而联合利用RE和LN树脂,并配合SR树脂的使用,可以将Sm和Nd的回收率提高到90%左右;LN树脂可以很好地分离Sm和Nd,并且回收的Nd可占总样量的85%左右.     

P204萃淋树脂对地质样品中痕量铌和钽的分离富集研究及其应用

研究结果表明，P204萃淋树脂在0．5—3mol／L HCl介质吸附钽，在1—8mol／L HCl介质吸附铌，1—3mol／L HCl介质中可同时吸附铌、钽。H2SO4 H2O2溶液解脱铌，酒石酸 HCl溶液解脱钽，H2SO4 H2C2O4溶液能同时解脱铌、钽，从而建立了新的铌和钽分离富集体系。分离后的铌、钽用光度法测定。方法用于测定地质样品中的铌和钽，结果与标准值符合，其RSD(n＝7)分别＜6％和9％。     

High Precision Hf-W Isotopic Measurements in Meteoritic Material Using Negative Thermal Ionisation Mass Spectrometry (NTIMS)

This paper presents a two-stage anion-exchange procedure for tungsten extraction, an improved mass spectrometric procedure for tungsten analysis and a simplified chemical separation and TIMS procedure for the determination of Hf concentrations. The chemical separation of tungsten is based on its complexing properties with HF and H₂O₂. The blank level for a sample size of 300 mg is about 80 pg for tungsten. The procedure is designed for the high sensitivity of negative thermal ionisation mass spectrometry (NTIMS) provided by the use of Mg oxide as an emitter on Ir filaments. Tungsten can be readily measured with a high precision in various meteoritical material and especially in small W-poor silicate fractions. Samples containing as little as a few ng g^-1 tungsten can be analysed reliably with this method.     

金在树脂相表面化学发光行为的研究

研究了金在树脂相表面吸附、发光行为、实验方法、仪器装置和仪器工作参数，建立了金的在线分离、富集发光检测新方法。pH值小于1的含金试样，通过装有717阴离子交换树脂脂柱后，金被定量吸队，通以碱性鲁米诺溶液，产生定量化学发光信号，方法的线性范围为0－0.200mg/L，检出限为0.003mg/L。结合金矿石国家二级标准物质分析验证，结果与标准值无显著性差异，RSD（n=10)为2.0%。     

P507萃取色层分离ICP—AES法测定高纯氧化镱中14种稀土杂质元素

本文采用Ｐ５０７萃取树脂－盐酸体系色谱法对高纯氧化镱中１４种稀土杂质元素进行分离、富集,用ＩＣＰ－ＡＥＳ法测定其稀土元素含量。当上柱量为２００ｍｇＹｂ２Ｏ３时,所能达到的测定下限：Ｅｕ２Ｏ３为１μｇｇ－１;Ｙ２Ｏ３,Ｇｄ２Ｏ３,Ｄｙ２Ｏ３,Ｈｏ２Ｏ３,Ｔｍ２Ｏ３,Ｌｕ２Ｏ３为２μｇｇ－１;Ｌａ２Ｏ３,Ｅｒ２Ｏ３为４μｇｇ－１;Ｐｒ６Ｏ１１,Ｎｄ２Ｏ３,Ｓｍ２Ｏ３,Ｔｂ４Ｏ７为８μｇｇ－１;ＣｅＯ２为１６μｇｇ－１。５次取样分离,加入试验回收率在８８％—１１２％之间,相对标准偏差＜１０％。本方法可适用于纯度为９９．９５％—９９．９９％的氧化镱中１４种稀土杂质元素的测定。     

大孔树脂纯化菠萝皮黄酮类化合物的研究

通过静态吸附与解吸实验,比较7种树脂对菠萝皮黄酮类化合物的吸附和解吸特性,筛选出较优的菠萝皮黄酮类化合物吸附剂,并检测吸附流速、上样液浓度、pH值、洗脱流速、洗脱剂体积分数等动态吸附性能。结果表明:AB-8树脂具有较好的吸附和解吸效果,吸附流速1mL/min、上样液浓度2.25mg/mL、pH值6、洗脱流速0.5mL/min、洗脱剂体积分数90%条件下,AB-8型大孔树脂可用于菠萝皮黄酮类化合物的分离纯化。