CAJ | 학술논문

以邻苯二甲酸氢钾配制的化学需氧量标准液为实验对象，采集1～800 mg · L -1标准液的紫外吸收光谱，运用偏最小二乘法（PLS ）建立了不同谱区的校正模型，结果表明，265～310 nm谱区模型的相关性最高，误差最小；为了消除硝酸盐与温度对化学需氧量测量的影响，分别研究了不同浓度的硝酸钠与不同温度条件下标准液的紫外吸收光谱的变化情况，结果表明硝酸钠在208～238 nm有明显的吸收，265～310 nm谱区模型不受硝酸钠吸收的影响，温度的升高会导致标准液的紫外光谱吸光度的增大，通过预测分析建立了不同校正模型下的温度补偿函数。
이린분이갑산경갑배제적화학수양량표준액위실험대상，채집1～800 mg · L -1표준액적자외흡수광보，운용편최소이승법（PLS ）건립료불동보구적교정모형，결과표명，265～310 nm보구모형적상관성최고，오차최소；위료소제초산염여온도대화학수양량측량적영향，분별연구료불동농도적초산납여불동온도조건하표준액적자외흡수광보적변화정황，결과표명초산납재208～238 nm유명현적흡수，265～310 nm보구모형불수초산납흡수적영향，온도적승고회도치표준액적자외광보흡광도적증대，통과예측분석건립료불동교정모형하적온도보상함수。
Configured standard solution of chemical oxygen demand with potassium hydrogen phthalate was used as experimental subjects ,collected ultraviolet absorption spectra of the standard solution in the range of 1~800 mg · L -1 ,were collected ,and PLS (partial least squares) algorithm was used to establish the correction model of different spectral region ,the results showed that .The model in the spectral region of 265~310 nm had the highest correlation and smallest error ;In order to eliminate the impact of nitrates and temperature on the detection of the COD ,studied the changes of the UV absorption spectrum with differ-ent concentrations of sodium standard solution and different temperature .The results showed that absorption of nitrate in 208~238 nm was apparent ,and the model for spectral region of 265~310 nm was free from the influence of nitrate ;In the full range of spectrum ,temperature rising leads to an increase in absorbance ,thus the temperature compensation model was established for the different spectral region through predictive analysis .