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| 折扣與優(yōu)惠：團(tuán)購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘 要:本文對(duì)溴酸鉀法測定銻礦石中銻的條件進(jìn)行改進(jìn)，用酒石酸、檸檬酸代替鹽酸來“穩(wěn)定”銻離子，抑制銻的水解，消除了鹽酸對(duì)環(huán)境、對(duì)操作者的危害。研究了絡(luò)合劑種類、用量，試劑加入順序，硫酸濃度，指示劑種類，滴定溫度等因素對(duì)硫酸銻溶液穩(wěn)定性和測定準(zhǔn)確度的影響。結(jié)果表明：硫酸-酒石酸-溴酸鉀法測定銻的適宜條件為：溫度控制在90℃，加入酒石酸的質(zhì)量為1g；（1+1）硫酸的體積為10ml；以0.1%的甲基橙作為指示劑時(shí)測定銻的結(jié)果與傳統(tǒng)的鹽酸-硫酸-溴酸鉀法的相接近。結(jié)果還表明，硫酸-檸檬酸-溴酸鉀法也是可行的，同樣也表明了硫酸-酒石酸-高錳酸鉀滴定法對(duì)測定銻的穩(wěn)定性較差，不宜使用。 關(guān)鍵詞：溴酸鉀；酒石酸；三氧化二銻；硫酸
ABSTRACT:In this paper, the potassium bromate for the determination content of antimony in the ore was improved. Addition of tartaric acid, citric acid instead of hydrochloric acid in the sample solution to keep antimony ion stable , to restrain antimony hydrolysis, to eliminates hydrochloric acid for the environment and the dangers of operator, Effect of several conditions above to solution stability and the accuracy was studied. It was indicated that the suitable conditions of determination of content antimony by KBrO3 method was follow: at 90℃ of the solution, addition of 1g tartaric acid, 10mL H2SO4(1+1) and titration of antimony ions in the solution with standard solution of KBrO3 with methyl orange to indicate end point of the reaction. It was shown that results obtained from class and improved KBrO3 methods is rather nearly. The new method is right. Keywords: Potassium bromated; tartaric acid; antimony trioxide; sulfuric acid |
