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대한화학회 창립 75주년
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09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제126회 대한화학회 학술발표회 및 총회
Turbidity measurement in absorbance unit
2020년 9월 10일 16시 44분 07초
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10월 21일(수) 17:30~18:00
, In-Yong Eom
Chemistry, Daegu Catholic University, Korea
Department of Life Chemistry, Daegu Catholic University, Korea
Turbidity refers to the cloudiness of water which loses its transparency by suspended particulate mattes and is used as an good indicator of water pollution level. Turbidity is commonly measured in NTU (Nephelometric turbidity unit). This method is not a direct measure of suspended particles in water but, instead, a measure of light intensity which is scattered by particles at an right angle. IR wavelengths is widely used for this purpose. Absorbance unit also can be used to measure the turbidity. Turbidity measured in NTU usually shows lower precision and accuracy at low levels in turbidity below ~10 NTU compared to the turbidity measurement in absorbance unit. In this study, a commercially available low cost turbidimeter was purchased and modified to measure a turbidity of the same turbid sample with both NTU and absorbance unit at the same time. This modification was done to compare both turbidity measurement methods and then which method is more effective for a certain condition (i.e. the degree of turbidity, linearity, type or color of suspended particles and so on). The calibration curve for the 1-400 NTU range showed R2=0.9996 in NTU unit and R2=0.9978 in absorbance unit respectively. So the linear range and linearity is almost same but absorbance unit showed overall better precision. This study shows that using ratiometry can improve the precision in turbidity measurement in NTU unit also. Furthermore, absorbance unit reflected the clarity of water more accurately which contained suspended black particles. The black particles even reduced the overall turbidity in NTU unit when the black particles was added to the turbid sample with suspended white particles. At a concentration of 1NTU, %RSD of turbidity meter decreased from 22.9% before calibration to 11.8% after calibration, and absorbance decreased from 24.5% before calibration to 2.7% after calibration. In the charcoal and turbidity sample mixture, the turbidity measurement decreases and the absorbance measurement increases. And we checked the effect of charcoal on turbidity by mixing the turbidity standard solution and charcoal. a photodiode measuring 890nm LED's reference and absorbance was attached to the turbidity meter sold on the market, and a turbidity meter equipped with the technology to measure correct turbidity and absorbance at the same time using the same sample was produced and evaluated. , resulting in a disadvantage of having to produce a calibration curve each time for accurate measurements. Therefore, effective calibration techniques are needed to improve accuracy for low concentrations of turbidity measurements.
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