2018, Volume 4, Issue 3
Engineering >> 2018, Volume 4, Issue 3 doi: 10.1016/j.eng.2018.05.005
A Non-Contact Original-State Online Real-Time Monitoring Method for Complex Liquids in Industrial Processes
Center for Heavy Metal Cleaner Production Engineering Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Abstract
Failures are very common during the online real-time monitoring of large quantities of complex liquids in industrial processes, and can result in excessive resource consumption and pollution. In this study, we introduce a monitoring method capable of non-contact original-state online real-time monitoring for strongly coated, high-salinity, and multi-component liquids. The principle of the method is to establish the relationship among the concentration of the target substance in the liquid (C), the color space coordinates of the target substance at different concentrations (L*, a*, b*), and the maximum absorption wavelength (λmax); subsequently, the optimum wavelength λT of the liquid is determined by a high-precision scanning-type monitoring system that is used to detect the instantaneous concentration of the target substance in the flowing liquid. Unlike traditional monitoring methods and existing online monitoring methods, the proposed method does not require any pretreatment of the samples (i.e., filtration, dilution, oxidation/reduction, addition of chromogenic agent, constant volume, etc.), and it is capable of originalstate online real-time monitoring. This method is employed at a large electrolytic manganese plant to monitor the Fe3+ concentration in the colloidal process of the plant’s aging liquid (where the concentrations of Fe3+, Mn2+, and (NH4)2SO4are 0.5–18 mg·L1, 35–39 g·L1, and 90–110 g·L1, respectively). The relative error of this monitoring method compared with an off-line laboratory monitoring is less than 2%.
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References
[ 1 ] Hansen EH, Miró M. How flow-injection analysis (FIA) over the past 25 years has changed our way of performing chemical analyses. TrAC Trend Anal Chem 2007;26(1):18–26. link1
[ 2 ] Hansen EH, Ruzicka J. Retro-review of flow-injection analysis. TrAC Trend Anal Chem 2008;27(5):390–3. link1
[ 3 ] Motteran F, Lima Gomes PC,Silva EL, Varesche MBA. Simultaneous determination of anionic and nonionic surfactants in commercial laundry wastewater and anaerobic fluidized bed reactor effluent by online column-switching liquid chromatography/tandem mass spectrometry. Sci Total Environ 2017;580:1120–8. link1
[ 4 ] Salazar-Beltrán D, Hinojosa-Reyes L, Ruiz-Ruiz E, Hernández-Ramírez A, Guzmán-Mar JL. Determination of phthalates in bottled water by automated on-line solid phase extraction coupled to liquid chromatography with UV detection. Talanta 2017;168:291–7. link1
[ 5 ] Lv ZL, Qi GM, Jiang TJ, Guo Z, Yu DY, Liu JH, et al. A simplified electrochemical instrument equipped with automated flow-injection system and network communication technology for remote online monitoring of heavy metal ions. J Electroanal Chem 2017;791:49–55. link1
[ 6 ] Dadfarnia S,Jafarzadeh MH.Online trace enrichment and determination of cobalt ion as an anionic complex by flow injection atomic absorption spectrometry. Microchem J 1999;63(2):226–34. link1
[ 7 ] Anthemidis A, Kazantzi V, Samanidou V, Kabir A, Furton KG. An automated flow injection system for metal determination by flame atomic absorption spectrometry involving on-line fabric disk sorptive extraction technique. Talanta 2016;156–157:64–70. link1
[ 8 ] Fasihi J,Shamsipur M,Khanchi A,Mahani M, Ashtari K.Imprinted polymer grafted from silica particles for on-line trace enrichment and ICP-OES determination of uranyl ion. Microchem J 2016;126:316–21. link1
[ 9 ] Kozak J,Latocha K,Kochana J,Wieczorek M,Kos´cielniak P.Simultaneous spectrophotometric flow injection determination of phosphate and silicate. Talanta 2015;133:150–4.
[10] Kozak J,Jodłowska N,Kozak M, Kos´cielniak P.Simple flow injection method for simultaneous spectrophotometric determination of Fe(II) and Fe(III). Anal Chim Acta 2011;702(2):213–7.
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