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铌(钽)铁中钛的光度法测定,基本是采用常用的钛的发色试剂二安替比林甲烷、变色酸、及过氧化氢。过氧化氢法的灵敏度低,而且铌有影响,所以不实用。本文就二安替比林甲烷及变色酸的发色条件作了进一步的试验。二安着比林甲烷光度法由于铌和钽很容易水解,导致部分钛被土酸共沉淀,使测定结果偏低,所以必须在草酸或酒石酸等介质中使其形成络合物而不水解。但这些介质的存在,影响发色速度及吸光度。关于介质对发色的影响,文献认为酒石酸、柠檬酸加入少,钛的结果偏高,加入多,钛的发色时间要长,消除铌的影响以加入草酸盐为最适当,但是文中仅提出在0.4%草酸的溶液中
Photometric determination of titanium in niobium (tantalum) iron is based on the commonly used titanium chromogenic reagent diantipyryl methane, chromotropic acid, and hydrogen peroxide. Hydrogen peroxide method of low sensitivity, and niobium have an impact, it is not practical. In this paper, the diantipyrine methane and chromogenic acid color conditions were further tested. Two Ann Bilin methane spectrophotometry Because niobium and tantalum are easily hydrolyzed, resulting in partial titanium was acid-coprecipitation, so that the measurement results are low, it must oxalic acid or tartaric acid and other media to form a complex without hydrolysis. However, the presence of these media, affecting hair color speed and absorbance. On the media on the color, the literature that less tartaric acid, citric acid added, titanium results are high, with more, titanium hair color longer, eliminating the impact of niobium to add oxalate is the most appropriate, but the paper only Proposed in 0.4% oxalic acid solution