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在金的分析方法中,吸光光度和火焰原子吸收法的灵敏度不够高,其下限为10~(-1)克/吨,不能满足微量测定和地球化学找矿的需要。目前看来微量金的分析有发展前景的是无火焰原子吸收法、中子活化法和阳极溶出伏安法,它们的灵敏度可达ppb级。由于我们遇到的样品中金含量大都在10~(-3)克/吨范围内,故采用本法测定,灵敏度可达0.006μg/ml/1%。为了有效地对金进行富集、分离,选用泡沫塑料吸附、富集金。一仪器装置及工作条件 1 仪器由本所自行组装的无焰钽环原子化器原子吸收光谱仪(图1),利用日本岛津厂QV-50型单色仪部件(石英棱镜)。自装测量放大器,电调制频率400周,具有对数转换和量程扩展性能。原子化器采用钟
In the method of gold analysis, the sensitivity of spectrophotometry and flame atomic absorption spectrometry is not high enough, and the lower limit is 10-1 gram / ton, which can not meet the need of micro-determination and geochemical prospecting. At present it appears that the analysis of trace gold has prospects for the development of flame atomic absorption spectrometry, neutron activation and anodic stripping voltammetry, their sensitivity up ppb level. Since the gold content in the sample we encountered is mostly in the range of 10 -3 g / t, the sensitivity of this method is up to 0.006 μg / ml / 1%. In order to effectively enrich the gold, separation, the choice of foam adsorption, enrichment gold. An instrument device and working conditions An instrument by the self-assembled flameless tantalum ring atomizer atomic absorption spectrometer (Figure 1), the use of Japan’s Shimadzu QV-50 type monochromator components (quartz prism). Self-installed measuring amplifier, electrical modulation frequency of 400 weeks, with logarithmic conversion and range expansion performance. Atomizer clock