红外光谱测定羧甲基纤维素钠的羧基含量  

Determination of Carboxyl Content in Sodium Carboxymethyl Cellulose by FT-IR Spectroscopy

作　　者：张燕兴[1] 叶君[1] 熊犍[2] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640 [2]华南理工大学轻工与食品学院,广东广州510640

出　　处：《造纸科学与技术》2010年第1期71-75,共5页Paper Science & Technology

基　　金：国家自然科学基金(50573025)资助项目

摘　　要：将羧甲基纤维素钠(CMC)经浓硝酸处理得到CMC-H,选取CMC-H的红外光谱吸收峰1735cm-1为特征吸收峰,以1918.9cm-1-1529.3cm-1为基线,避免了水分含量对1735cm-1峰高的影响;硫氰化钾(KSCN)作为内标物,得到了线性关系较好的标准曲线(R2=0.980)。实验结果表明,可用傅立叶变换红外光谱法(FT-IR)测定羧甲基纤维素钠中的羧基含量。Sodium carboxymethyl cellulose （CMC） is converted to CMC -H, treated with concentrated nitric acid. Then CMC - Hss characteristic infrared absorption at 1735cm -1 was selected as the characteristic peak. The base- line of 1918. 9cm-1 - 1529.3cm -1 is used, to avoid the influence of moisture content on the measurement of1735cm-~ peak height. KSCN was used as a internal standard and a good linear standard curve has been got（ R2 = 0. 980）. The results indicate that carboxyl content in sodium carboxymethyl cellulose can be analyzed by the method of Fourier transform infrared spectroscopy （ FT - IR） .

关 键 词：傅立叶变换红外光谱 羧甲基纤维素钠 羧基含量 内标法 

分 类 号：TQ342[化学工程—化纤工业]