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研究了样品溶解方法、铌元素分析线的选择,基体元素和主要共存元素钼、铬、铜、钨、铬、钛对铌测定的影响,并在优化的条件下实现了用电感耦合等离子体原子发射光谱(ICP-AES)法测定镍基合金中铌。结果表明:采用硫酸结合酒石酸溶解样品,根据干扰元素钒和钨的含量不同,择优选用309.418 nm,319.498 nm,316.340 nm谱线作为分析线并结合干扰校正技术可消除镍基合金中共存元素的干扰。使用该法测定了镍基合金标准物质中铌,分析结果与认定值一致,测定结果的相对标准偏差(n=6)在0.5%~6.4%之间。 相似文献
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采用硫酸和硝酸溶解样品,加入草酸铵溶液以溶解试样处理中形成的盐类和防止试液中铌、钨和锆水解,在优化仪器工作参数条件下用电感耦合等离子体原子发射光谱法(ICP-AES)测定试液中铌、钨、锆含量,从而建立了钢中铌、钨和锆的测定方法。研究表明:通过加热,0.1 g钢样能溶解于15 mL硫酸(1+4)和几滴硝酸中,且冒硫酸烟后出现的盐类,加入10 mL 4.0 g/L草酸铵溶液可将其溶解完全。以Nb 316.340 nm,Zr 343.823 nm,W 207.011 nm为分析谱线,采用基体匹配方法克服基体干扰。待测元素校准曲线相关系数大于0.999 5,铌、钨和锆的检出限分别为 1.9、9.9 和 3.2 ng/mL。方法应用于YSBC11217-94低合金钢标准样品中铌、钨和锆的测定,结果与认定值相符,相对标准偏差(n=10)分别为1.7%,1.1%和2.1%,加标回收率在97%~104%之间。对其他标准样品(合金钢、合金结构钢、低合金钢)及合成钢样品中铌、钨、锆进行测定,测定值与认定值或参考值相符。 相似文献
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探讨了ICP-OES法测定低合金钢中硅、锰、铬,研究分析谱线的选择,基体元素、共存元素之间的干扰问题,进行了酸度试验.对测定结果进行不确定度评定,结果满意,建立了对低合金钢的ICP-OES测定法. 相似文献
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火焰原子吸收光谱法测定载金炭中金 总被引:1,自引:0,他引:1
采用火焰原子吸收光谱法测定了载金炭中的金,并经过方法条件实验,确定了最佳测定条件。该方法相对标准偏差为0.37%~1.01%,加入标准物质回收率为100.4%~102.7%。该方法与经典火试金法对比,测定结果完全符合。 相似文献
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火焰原子吸收光谱法测定铜及铜合金中微量镍 总被引:1,自引:0,他引:1
采用硫代硫酸钠掩蔽主体铜,主体铜不分离,用酒石酸抑制铁,锑等生成氢氧化物沉淀,以三氯甲烷萃取镍与丁二酮肟形成的络合物,经1 mol/L盐酸反萃后,用火焰原子吸收光谱法测定。方法操作简便易掌握,检测限可达0.000 05%、方法回收率为98%以上,精密度0.002%镍时变异系数为2.2%。 相似文献
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中国岩金地采矿山采矿技术进展及研究方向 总被引:1,自引:0,他引:1
中国黄金矿床经历60多年开采之后,目前仍然以岩金开采为主,伴生金及砂金为辅,在岩金开采中,仍然以地下开采为主,露天开采为辅。在地下开采三大类采矿方法中,以浅眼留矿采矿法为主、全面和房柱采矿法为辅的空场采矿法到21世纪初期仍占60%以上,充填采矿法约占30%左右,其余是崩落采矿法和其他组合采矿法。详述了21世纪初期中国岩金地下开采工艺技术特点,探究了中国岩金地下开采采矿技术研究方向,供采矿同仁参考。 相似文献
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The efficiencies of an enzyme method and the sodium hypochlorite method in hatching eggs of Taenia solium (Henan strain) were compared. The viability of the hatched oncospheres was determined by staining with trypan blue. For the former method, the hatching rate and viability percentage were 85.7% and 79.7%, respectively. The corresponding figures for the latter method were 97.9% and 86.7%, respectively. These findings indicate that the sodium hypochlorite method is a simple, efficient and practical method for hatching eggs of Taenia solium. 相似文献
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一种利用火焰原子吸收法快速测定铜镉渣中铜、镉、铅、锌的方法。试样经王水消解后,在试验条件下进行测定,加标回收率为97.9%~100.8%,相对标准偏差为1.59%~14.29%,具有较高的精密度和准确度。该法适用于铜镉渣中Cu、Cd、Pb、Zn含量大于0.1%试样的测定。 相似文献
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Straightforward solid-phase extraction (SPE) methods were developed for the determination of verapamil and its metabolite in a plasma matrix. The spiked plasma sample was pretreated with 2% phosphoric acid followed by two different SPE methods using a Waters Oasis HLB 96-well extraction plate. Recoveries greater than 90% were obtained using both a generic and a selective SPE methods. The generic method is a good starting protocol, and it is applicable to a wide range of compounds. This generic method consists of using 5% methanol as the wash solvent, and 100% methanol for the elution. The limitation of the non-specific method is that it does not remove all plasma constituents that interfere with the quantitation of the metabolite, norverapamil. A second, more specific method was developed using the same Oasis HLB sorbent which removes more plasma interferences and provides cleaner extracts for the HPLC-UV analysis. This selective method uses both the methanol concentration and the pH advantageously to preferentially isolate the analytes of interest from a complex sample matrix. Recoveries of greater than 90% with R.S.D.s less than 3.8% were obtained with this selective method. 相似文献
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Myocardial perfusion imaging with 99mTc-MIBI was studied in 80 patients with coronary artery disease (CAD), 29 cases of normal controls and 37 cases of noncoronary heart diseases. The perfusion imaging was analysed both by qualitative and quantitative methods. The results revealed that the diagnostic sensitivity, specificity and accuracy for CAD were 91.5%, 83.8%, and 88.5% respectively by qualitativ method, and were 88.1%, 94.6% and 90.6% respectively by quantitative method. The diagnostic sensitivity of electrocardiogram (ECG) was 69.5%. Fourteen cases with the narrowing of coronary artery > 50% shown by coronary angiography also had abnormal myocardial perfusion imaging. It suggests that analysis of perfusion imaging by quantitative method in detecting CAD is superior than qualitative method and ECG. 相似文献