Determination of Organic Matter by Uv Absorption in the Ground Water / Organinių Medžiagų Požeminiame Vandenyje Nustatymas Taikant Uv Bangų Absorbciją

Abstract

Organic matter in drinking water is determined by applying indirect determination methods used for quantitative measurements such as total organic carbon (TOC), chemical oxygen demand (COD), and biochemical oxygen demand (BOD). These analyses require expensive devices, harmful chemical reagents, and are time consuming. Standard water quality tests are inconvenient during start-up or reconstruction of drinking water treatment plants as samples need to be transported to a laboratory and no on-line measurements on plant performing efficiency are available. For practical purposes, less sophisticated and faster methods to determine organic matter are required. One of the methods could be ultraviolet absorption of water at 254 nm wavelength (UV254). It is a technically simple and fast method for determining natural organic matter, requiring neither expensive measurement equipment nor chemical reagents. The present article aims at investigating the possibilities of practical applications of UV254 method to determine the concentration of natural organic matter in ground water. The research proved good correlation between TOC and UV254, as well as between CODMn and UV254. The outcomes of the research indicate that UV254method can be successfully applied to determine natural organic matter concentrations in ground water. Santrauka Organinės medžiagos požeminiame vandenyje nustatomos netiesioginiais kiekybiniais bendrosios organinės anglies (BOA), cheminio deguonies suvartojimo (ChDSMn) ir biocheminio deguonies suvartojimo (BDS) metodais. Šioms analitėms nustatyti būtini brangūs prietaisai, kenksmingi cheminiai reagentai, tyrimai ilgai trunka. Diegiant naujus geriamojo vandens gerinimo įrenginius ir atliekant įrenginių paleidimo, derinimo bei eksploatavimo proceso efektyvumo vertinimą, minėtuosius geriamojo vandens tyrimus nepatogu ir brangu atlikti, todėl šiais atvejais reikia paprastesnio ir greitesnio organinių medžiagų nustatymo metodo. 254 nm bangos ilgio (UV254) ultravioletinių spindulių absorbcija yra techniškai paprastas, spartus organinių junginių koncentracijų nustatymo metodas, jį taikant nebūtina brangi tyrimų įranga bei cheminiai reagentai. Šio darbo tikslas buvo ištirti UV254 metodo tinkamumą organinių junginių koncentracijoms nustatyti požeminiame vandenyje. Atlikus tyrimus apibrėžtos priklausomybės tarp BOA ir UV254 bei tarp ChDSMn ir UV254. Remiantis tyrimų rezultatais galima teigti, kad ultravioletinių spindulių absorbcijos metodas gali būti sėkmingai taikomas organinių junginių koncentracijoms požeminiame vandenyje nustatyti.

Effect of natural organic matter on the photo‐induced toxicity of titanium dioxide nanoparticles

“…Natural organic matter can stabilize and prolong the suspension of nano‐TiO 2 in the water column , which can potentially increase its phototoxicity to aquatic organisms by lengthening their exposure to nano‐TiO 2 . Natural organic matter can also attenuate a certain percentage of UV from the system and quench ROS produced during the photoexcitation of nano‐TiO 2 , which can both potentially decrease the overall phototoxicity of nano‐TiO 2 to aquatic organisms. However, chronic exposure to UV and ROS can degrade NOM , which could alter its impact on nano‐TiO 2 stability and toxicity.…”

Relationship, importance, and development of analytical techniques: COD, BOD, and, TOC in water—An overview through time

“…Both methods are coupled to generate simultaneous TOC and NT results 0.5-100 mg C/L Fan et al, [25] bekiari et al, [6] Ultraviolet-visible spectroscopy Saline water and freshwater Organic matter is determined at a wavelength of 250 − 300 nm. Then absorbance is analyzed with multiple linear regression models to estimate the TOC value and compare it with the traditional method 10-200 mg L −1 Albrektienė et al, [3] Knapik et al…”

Integrated ion exchange mixed bed with reverse osmosis and nanofiltration for isolation of neutral dissolved organic matter from natural waters

“…; Albrektienė et al . ) to represent the aromatic character of the organic species, whereas at 444 nm, it represents the excess of potassium dichromate (K 2 Cr 2 O 7 ) after digestion to determine the COD concentration (Rodier et al . ).…”