原子吸收法测定矿石及钨、钼、铜、锡精矿中微量铋

原子吸收分光光度法测定矿石中微量铋已有报导。我们以矿石及钨、铝、锡、铜精矿为对象,进行了原子吸收法测定铋的有关条件、干扰及其消除实验。拟定了0.020％～1％范围内铋的测定方法。一、仪器与试剂仪器 P-E503型原子吸收光谱仪,国产铋空心阴极灯(上海)。     

氢化物-原子吸收光谱法测定地球化学样品中的砷、锑、铋

氢化物-原子吸收光谱法是测定砷、锑、铋等元素的一种快速、灵敏、准确的方法,国内外已有不少报导。但是对共存元素的干扰研究较少,难于直接用于组成复杂的地质样品分析。为了适应大批地球化学样品中砷、锑、铋的分析,本文较详细地研究了用氢化物-原子吸收光谱法在同一份溶液中连续测定砷、锑、铋的仪器工作条件、氢化物发生条件及共存元素的干扰。选出了对砷、锑、铋均为有效的还原抑制剂。在选定的条     

铋中微量锂的火焰光度测定

本文报告了用火焰分光光度法测定铋中微量锂的高灵敏度方法。基体铋用碱式硝酸铋形式水解分离。测定下限为0.1微克/克。     

石墨炉原子吸收法测定高纯镍中痕量铋

本文利用石墨炉原子吸收法，在等温平台条件下直接测定了高纯镍中的痕量铋，并对石墨炉加热程序中的干燥时间，灰化温度及原子化温度进行了优化，同时也考察了介质酸度的影响，试验表明：基体镍对铋的测定有显著的影响，为此对标准系列进行了基体匹配，本方法的特征质量为6．1pg，相对标准偏差为3．6％，加标回收率为99．3％－104％。     

活性艳蓝铋染料的合成及其光谱研究

本文以活性艳蓝和硝酸铋为原料，合成了活性艳蓝铋染料。对产物进行了铋含量的测定，测定了产物的可见光吸收光谱、红外光谱。     

枸橼酸铋制剂中铋元素的溶出量分析

微波消解溶样，ICP—AES法测定了枸橼酸铋制剂中铋元素的含量及其在人工胃液和人工肠液中的溶出量。结果表明，枸橼酸铋制剂中的铋元素在人工肠液中的溶出量明显高于人工胃液。方法的检出限为12ng／mL，相对标准偏差(n=7)为3．84％。     

悬浮液氢化物发生原子荧光光谱法测定化探样品中痕量铋

本文提出了一种把悬浮液技术与氢化物发生法相结合原子荧光光谱测定化探样品中痕量铋的分析方法，试验了悬浮粒度，酸介质，悬浮液浓度等因素对铋氢化物发生效率的影响，采用水溶液标准校正，方法简便，结果准确可靠。     

一种简易火焰氢化法原子吸收测定矿石及金属铅中微量铋

氢化物-原子吸收法,是70年代发展起来的一种分析方法。此法可以灵敏地测定砷、锑、铋、锡、硒、碲等元素。但需用专门的装置,干扰较多,精度较差,不能满足较高含量的各种矿石、精矿样品的分析。近年来,国內研制一种简单、快速,不用特殊装置的双毛细管喷雾器、双喷雾器对吹的火焰氢化物-原子吸收法。灵敏度比一般的空气-乙炔火焰法提高一个数量级,并具有干扰少,精度高等特点。本文提出另一种更简易的方法。经实验证明,其效果与上述方法一样。由于容易制造很适合一般实验室使用。铋的灵敏度为0.015μg/ml,仪器精度可达0.2％,相对标准偏差≤2.0％。可测定矿石、钨、铜、铅、锌、镉精矿中0.00x％和金属铅中0.000x％的铋。     

氢化物发生-原子荧光法测定中草药中的痕量铋

研究了氢化物发生-原子荧光法测定中草药中痕量铋的适宜条件, 试验了不同的消解方式、酸介质和还原剂的用量对测定铋的影响。在最佳测定条件下, 铋的线性范围为0.1～200 μg·L-1, 检出限为0.094 6 μg·L-1。仪器的相对标准偏差为0.55%, 加标回收率为94%～107%。结果表明本法具有快速、简便和准确等特点。     

阳离子金黄铋染料的合成及其光谱研究

本文以阳离子金黄和硝酸铋为原料合成了阳离子金黄铋染料,并对产物进行了铋含量的测定,测定了产物的可见光吸收光谱,红外光谱。     

氢化物发生原子荧光光谱法测定钢铁及合金材料中痕量铋

采用氢化物发生原子荧光光谱法 ,研究了用硫代氨基脲—抗坏血酸及磷酸作干扰抑制剂消除大量基体元素干扰 ,提出了钢铁及合金材料中痕量铋的分析方法。方法的检出限为Bi=0 0 2 μg·g-1( 3δ ,n =11,0 2 0 0 0 g试样 )。用该方法分析了中低合金钢 ,铁镍基、镍基、钴基高温合金 ,铜合金等样品 ,获得了满意的结果。     

铋膜电极电位溶出法测定水果罐头中的痕量Sn2+

研究了同位镀铋膜法制备铋膜电极测定痕量Sn2+的电位溶出法。在0.1mol/L HAc-NaAc缓冲溶液(pH 4.8)中,通过开路富集于-1.2V进行电沉积,Sn2+与Bi3+被还原为单质富集于电极表面,在铋膜电极的电催化作用下再进行电位溶出,于-0.61V左右单质锡被氧化为Sn2+获得一灵敏的氧化溶出峰,其浓度与峰值成线性关系,线性范围为0.1—5.0mg/L,该方法的最低检出限为0.03mg/L(3σ)。利用该电极测定了水果罐头中痕量Sn2+的含量,并与国标方法作对比实验,结果表明该方法可用于实际样品分析。     

铋、氧化铋、硫化铋在硝酸-硫脲中的溶解性

研究了铋、氧化铋、硫化铋在硝酸-硫脲中的溶解性。三价铋离子与硫脲溶液可形成黄色络合物,在波长为460nm处,反应温度为25℃,反应时间为6min,硝酸浓度为1.0mol/L,硫脲浓度为0.5mol/L,振荡速率为160r/min条件下铋含量在0.059—4.57μg/mL范围内服从郎伯-比尔定律,检出限为m=0.04μg。铋矿物的溶解性顺序大小为Bi2O3>Bi>Bi₂S₃。本方法操作简便,可靠,实验结果满意,具有广泛的实用意义。     

Cloud-Point Extraction and Spectrophotometric Determination of Trace Quantities of Bismuth in Environmental Water and Biological Samples

ABSTRACT

A cloud-point extraction (CPE) process using the nonionic surfactant Triton X-114 to extract bismuth from aqueous solutions was investigated. The method is based on the complexation reaction of Bi(III) with 4-(2-benzothiazolylazo)2,2′-biphenyldiol (BTABD) and micelle-mediated extraction of the complex. The optimal extraction and reaction conditions (e.g., pH, reagent concentration, surfactant concentration, and effect of time) were studied. The analytical characteristics of the method (e.g., linear range, molar absorptivity, Sandell sensitivity, optimum Ringbom concentration ranges, limits of detection and quantification, preconcentration factor, and improvement factors) were obtained. Linearity was obeyed in the range of 2.50–85.0 ng mL^?1 of Bi(III) ion. The detection limit of the method was 0.75 ng mL^?1 of Bi(III) ion. The interference effect of some anions and cations was also tested. The method was applied to the determination of bismuth in environmental water, human hair, and urine samples.     

Point Defects of Bismuth in TlInTe2 Crystals: Electrophysical and Dielectric Properties of Solid Solutions

Physics of the Solid State - The TlInTe2–Bi phase diagram was studied in the concentration region of 0–10 at % of Bi by complex methods of physicochemical analysis, and the bismuth...     

流动注射-氢化物发生-原子吸收光谱法测定果胶铋

本文采用流动注射 氢化物发生 原子吸收光谱法测定了果胶铋中铋的含量 ,方法简单、快速、准确 ,考察了实验参数对测定果胶铋中铋的影响。线性范围为 0 0 0～ 4 4 0 0ng·mL- 1 ,工作曲线回归方程为A =0 0 12 +0 0 17c(c:ng·mL- 1 ) ,相关系数r=0 9995 ,检测限为 0 0 95ng·mL- 1 ,回收率在 97 3%～ 10 3 3% ,用于实际样品的分析结果满意。     

Pressure induced superconductivity in Bismuth

Abstract

In this paper, we report the high pressure band structure and superconductivity calculated for Bi at 9 GPa. The band structure calculation was performed using the LMTO method. The theoretically calculated value of superconducting transition temperature is found to be in good agreement with the experimentally observed value. It is concluded that the same mechanism of s → electron transfer under pressure, which has been used by us for explaining the pressure induced superconductivity in many solids, is found to be responsible for promoting T, in Bi also.     

Bismuth onion thin film in situ grown on silicon wafer synthesized through a hydrothermal approach

Bismuth onion structured nanospheres with the same structure as carbon onions have been synthesized and observed. The nanospheres were synthesized through a hydrothermal method using bismuth hydroxide and silicon wafer as reactants. By controlling the heating temperature, heating time, and the pressure, nanoscale bismuth spheres can be in situ synthesized on silicon wafer, and forms a bismuth onion film on the substrate. The electronic property of the films was investigated. A formation mechanism of the formation of bismuth onions and the onion film has been proposed on the basis of experimental observations.