1-Hydroxy Ethylidene-1,1-Diphosphonic Acid at Different pH Values:Preparation and Spectra Analyses
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摘要:
羟基乙叉二膦酸受pH值影响很大.以质量分数为25%的NaOH溶液为滴定剂,制备pH值为2~13的羟基乙叉二膦酸（HEDP）,研究了各pH值时HEDP的红外光谱,用拉曼光谱、等离子体发射光谱进行验证.光谱研究结果显示,pH值=2时主要是以羟基乙叉二膦酸存在,随着pH值升高,羟基乙叉二膦酸依次以一钠盐、二钠盐、三钠盐、四钠盐存在;816cm-1δOH吸收峰和630cm-1υP-C吸收峰是羟基乙叉二膦酸及其钠盐的特征吸收峰,α位碳的羟基变形振动吸收不变,和氧相连的υP-C随pH值升高吸收波数逐渐增大.
1-Hydroxy ethylidene-1,1-diphosphonic acid （HEDP） is much affected by pH values. In the present paper, HEDP was prepared at different pH values ranging from 2 to 13, by NaOH solution with 25 % of mass fraction as titrant. The FTIR spectra of HEDP at different pH values were studied and validated by Raman and plasma emission spectroscopy. The re- sults show that HEDP is the main product at pH= 2 while its monosodium, disodium, trisodium and tetrasodium salts exist in turn with increasing pH; the δOH band at 816 cm^-1 and up-c band at 630 cm^-1 are the characteristic bands of HEDP and its sodi- um salt. In addition, the deformation vibration band of δOH band at a position remains unchanged whereas the intensity of up-c band attached to oxygen increases gradually with increasing pH values.
作者:
庄玉伟 郭辉 王华芬 张国宝 曹健 赵根锁
机构地区:
河南省科学院高新技术研究中心
出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2015年第5期71-74,共4页
基金:
河南省重点攻关项目(142102210088)
关键词:
羟基乙叉二膦酸 PH值 红外光谱 拉曼光谱
HEDP pH value infrared spectra raman spectra
分类号:
O657.3 [理学—分析化学]
