The method of optical detection to test polyacrylamide solution was developed which took advantage of TU-1901/1900 double-beam UV-Vis spectrophotometer and IRPrestige-21 FT-IR Spectrometer to measure the transmitted spectrum of polyacrylamide solution in the range of 5~600 mg·L-1 concentration.The spectrum characteristics and inverse analysis their concentrations of polyacrylamide solution within the wavelength of 190~900 nm and 400~4 000 cm-1 were investigated.The results show that there are strong absorption of polyacrylamide solution in 200~300 nm,400~920 cm-1,2986~3 684 cm-1 and the transmittances of solution with different concentrations have linear relationship at 220 nm and 2 623 cm-1;the maximum calculation error to inverse the unknown concentrations successively are 6.98%,2.34% and 0.79%,when inversion calculation uses 2,3,4 measured values in ultraviolet band.%提出了光学检测聚丙烯酰胺溶液的方法,利用TU-1901/1900双光束紫外可见分光光度计、IRPrestige-21傅立叶变换红外光谱仪测量5~600 mg·L-1浓度范围内聚丙烯酰胺溶液的透射光谱,研究了其在波段190~900 nm和400~4 000 cm-1的光谱特性,进行了其浓度的反演分析.研究表明: 聚丙烯酰胺溶液在200~300 nm和400~920 cm-1,2 986~3 684 cm-1范围存在较强吸收特性,其透光度在220 nm,2 623 cm-1处有一定的线性关系;在紫外波段基于2,3和4个透光度测量值反演其未知浓度的计算误差最大值分别为6.98%,2.34%和0.79%.
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