近红外光谱法测定涂料稀释剂中苯系物含量

Determination of content of benzene homologues in paint thinner by NIRS

建立使用近红外光谱法（ NIR）快速测定溶剂型木器涂料稀释剂中甲苯、乙苯、对二甲苯、间二甲苯和邻二甲苯等苯系物含量方法。收集涂料稀释剂样品，使用气相色谱法（ GC）测定苯系物含量，并采集其近红外光谱信息，采用偏最小二乘法（ PLS ）建立NIR光谱与苯系物含量的线性关系模型。苯系物校正均方差（ RM-SEC）在（0．47~1．40）%之间、相关系数（R2）在0．956~0．988之间；预测均方差（RMSEP）在（0．73~2．32）%之间、相关系数（ R2）在0．951~0．986之间。 NIR模型预测效果良好，定量方法快速、简单、准确，可在检测涂料的有毒有害物质中推广应用。

Near-infrared（ NIR） spectrum was applied for the rapid quantitative determination of benzene homologues（ toluene,ethyl-benzene,p-xylene, m-xylene and o-xylene） in paint thinner of solvent based coatings for woodenware. After samples of paint thinner were collected,firstly gas chromatography（ GC） was used to detect content of benzene homologues;secondly their NIR spectra were collected;finally partial least square（ PLS） was used to develop a linear correlation between their NIR spectra and content of ben-zene homologues. Root mean square error of calibration（RMSEC）of benzene homologues were between（0. 47~1. 40）%,and their square of the correlation coefficient（ R2 ） were between 0. 956~0. 988. Root mean square error of prediction（ RMSEP） were between （0. 73~2. 32）%,and their square of the correlation coefficient（R2）were between 0. 951~0. 986. NIR model prediction effect was good. The NIR quantitative method was rapid,simple,accurate,and it could be applied in determination of toxic and harmful sub-stances in coatings.