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一种紫外-可见光谱法检测水质COD的浊度影响实验研究

Experimental Research of Turbidity Influence on Water Quality Monitoring of COD in UV-Visible Spectroscopy

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摘要

消除浊度影响是直接光谱法检测水质COD的关键技术问题。 此源于紫外-可见光谱法检测水质参数的关键依赖于化学计量法所建立的准确的水质参数分析模型, 而浊度是影响其建模的一个重要参数。 为此, 选取福尔马肼浊度液和邻苯二甲酸氢钾标准溶液, 开展了紫外-可见吸收光谱法检测水质COD的浊度影响实验研究, 获得了选定溶液在245, 300, 360和560 nm几个特征波长点的吸光度随浊度变化的最小二乘法拟合曲线, 分析了吸光度随浊度的变化规律。 研究结果表明, 在240~380 nm的紫外光谱段, 由于引起浊度的颗粒物对有机物产生了吸附, 致使浊度对水样的紫外光谱影响较为复杂; 在380~780 nm的可见光谱区域, 浊度对光谱的影响则是随着波长的增大而减弱。 基于此, 开展了多元散射校正法对受浊度影响的水样光谱进行校正试验。 对某溪水水样的紫外-可见吸收光谱进行多元散射校正, 通过处理前后光谱对比表明, 浊度引起各个波长点的基线偏移都得到了有效的校正, 而在紫外区域特征并未减弱。 接着对选取的三种液体的紫外-可见吸收光谱进行多元散射校正, 实验结果表明: 该方法可在不影响水样紫外-可见吸收光谱特征的前提下对其吸收曲线进行有效的校正, 这不仅提高了光谱法检测水质COD的信噪比, 而且还为化学计量法建立准确、 有效的水质检测COD分析模型进行数据预处理提供了一种新途径。

Abstract

Eliminating turbidity is a direct effect spectroscopy detection of COD key technical problems. This stems from the UV-visible spectroscopy detected key quality parameters depend on an accurate and effective analysis of water quality parameters analytical model, and turbidity is an important parameter that affects the modeling. In this paper, we selected formazine turbidity solution and standard solution of potassium hydrogen phthalate to study the turbidity affect of UV - visible absorption spectroscopy detection of COD, at the characteristics wavelength of 245, 300, 360 and 560 nm wavelength point several characteristics with the turbidity change in absorbance method of least squares curve fitting, thus analyzes the variation of absorbance with turbidity. The results show, In the ultraviolet range of 240 to 380 nm, as the turbidity caused by particle produces compounds to the organics, it is relatively complicated to test the turbidity affections on the water Ultraviolet spectra; in the visible region of 380 to 780 nm, the turbidity of the spectrum weakens with wavelength increases. Based on this, this paper we study the multiplicative scatter correction method affected by the turbidity of the water sample spectra calibration test, this method can correct water samples spectral affected by turbidity. After treatment, by comparing the spectra before, the results showed that the turbidity caused by wavelength baseline shift points have been effectively corrected, and features in the ultraviolet region has not diminished. Then we make multiplicative scatter correction for the three selected UV liquid-visible absorption spectroscopy, experimental results shows that on the premise of saving the characteristic of the Ultraviolet-Visible absorption spectrum of water samples, which not only improve the quality of COD spectroscopy detection SNR, but also for providing an efficient data conditioning regimen for establishing an accurate of the chemical measurement methods.

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中图分类号:O657.3

DOI:10.3964/j.issn.1000-0593(2014)11-3020-05

基金项目:国家自然科学基金项目(61201346)和四川省科技支撑计划项目(2012SZ0111)资助

收稿日期:2013-11-04

修改稿日期:2014-03-25

网络出版日期:--

作者单位    点击查看

汤斌:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
魏彪:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
吴德操:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
米德伶:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
赵敬晓:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
冯鹏:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
蒋上海:重庆大学光电技术及系统教育部重点实验室, 重庆 400044
毛本将:四川碧朗科技有限公司, 四川 绵阳 621900

联系人作者:汤斌(tangbin8@sina.com)

备注:汤斌, 1985年生, 重庆大学光电工程学院博士研究生

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引用该论文

TANG Bin,WEI Biao,WU De-cao,MI De-ling,ZHAO Jing-xiao,FENG Peng,JIANG Shang-hai,MAO Ben-jiang. Experimental Research of Turbidity Influence on Water Quality Monitoring of COD in UV-Visible Spectroscopy[J]. Spectroscopy and Spectral Analysis, 2014, 34(11): 3020-3024

汤斌,魏彪,吴德操,米德伶,赵敬晓,冯鹏,蒋上海,毛本将. 一种紫外-可见光谱法检测水质COD的浊度影响实验研究[J]. 光谱学与光谱分析, 2014, 34(11): 3020-3024

被引情况

【1】李 丹,郝富国,蔡宗岐,冯巍巍. 水质化学需氧量(COD)检测技术与系统研究. 光电技术应用, 2016, 31(1): 80-82

【2】张贤龙,张 飞,张海威,海 清,陈丽华. 艾比湖流域地表水二维荧光峰值与水质指标关系初探. 光谱学与光谱分析, 2018, 38(2): 481-487

【3】赵明富,唐 平,汤 斌,何 鹏,徐杨非,邓思兴,石胜辉. 基于小波变换的压缩感知理论对水质检测紫外-可见光谱数据的去噪研究. 光谱学与光谱分析, 2018, 38(3): 844-850

【4】李鑫,盛宇博,姜吉光,苏成志. COD光谱法检测中的波长优化及温度补偿实验研究. 光学技术, 2019, 45(6): 690-695

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