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印度发展了一种测定水溶液介质中的钛的简便、快速、有选择性的和灵敏的分光光度法.在pH1～7范围内,金属离子与2,4-二羟基苯甲醛异菸腙(2,4—DHBINH)形成淡红褐色的络合物.该络合物显示出两个吸收极大,一个在430nm处,另一个在500nm处.在pH1.5时,试剂在430nm显示出相当大的吸光度,而在500nm的吸光度很小.Ti(Ⅳ)含量在0.09～2.15μg mL~(-1)范围内,服从比耳定律.方法的摩尔吸收率和Sandell灵敏度分别为1.35×10~4Lmol~(-1)cm~(-1)和0.0049μgcm~2.提出一种用一阶导数分光光度法测定Ti的方法,并成功应用于测定镍基高温合金、钛基合金和低合金钢等的钛含量.结果比过氧化氢法灵敏度好;比铬变酸法具有更多优点;比其它腙法更灵敏.本法在抗坏血酸存在下有高度选择性.
India has developed a simple, rapid, selective and sensitive spectrophotometric method for the determination of titanium in aqueous media in the pH range of 1 to 7. The interaction of metal ions with 2,4-dihydroxybenzaldehyde isoniazid (2 , 4-DHBINH). The complex showed two very large absorptions, one at 430 nm and the other at 500 nm. At pH 1.5, the reagent showed quite large at 430 nm , And the absorbance at 500 nm was very small.The molar ratio of Ti (Ⅳ) to the Sandell was 0.09 ~ 2.15 μg mL -1 and Beer’s Law was obeyed.The molar absorptivity and the Sandell sensitivity of the method were 1.35 × 10 ~ 4L mol ~ (-1) cm ~ (-1) and 0.0049μgcm ~ 2, respectively. A new method for the determination of Ti by first derivative spectrophotometry was proposed and successfully applied to the determination of nickel based superalloy, titanium based alloy and low alloy steel Of the titanium content of the results than the hydrogen peroxide sensitivity is good; more than chromic acid has more advantages than other hydrazone method is more sensitive to this law in the presence of ascorbic acid is highly selective.