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Journal of the Korean Society for Environmental Analysis 2011;14(4):257-261.
Selection of Reference Material for Automatic Continuous Measurement of Suspended Solids
부유물질 연속자동측정기 기준물질의 선정
안양기1, 박종환1, 홍경기1, 장희수1, 최성헌2, 최종우2
1한국환경공단
2국립환경과학원
Abstract
Suspended solid (SS) is a particulate matter less than 2 mm in water and an important indicator of Environmental Water Quality. SS was traditionally analysed by weighing in laboratory. Recently, automatic continuous measurement of SS was included as a routine monitoring of Water Tele-Monitoring System (TMS) in Korea by “Law for Environmental Testing and Inspection” and by “Law for Water Quality and Aquatic Ecosystem Preservation.” However, the standard material for this automated SS analysis is not well defined in the Korean official method. The research used microcrystalline cellulose which is the standard material of ISO 11923 as a reference material and used cellulose fiber medium and Inulin as comparative materials which have same molecular formula with microcrystalline cellulose. Recovery rates of microcrystalline cellulose, cellulose fiber medium, and Inulin were 100.1%, 100.5%, and 30.9%, respectively. Some part of Inulin was dissolved in distilled water, so it cannot be used for the standard material. The variation coefficients of microcrystalline cellulose, cellulose fiber, and inulin were 5.5%, 7.7%, and 6.0%, respectively. The correlations between laboratory SS and TMS results for all materials were very high (r > 0.99). It seems like that microcrystalline cellulose suggested by ISO can be the best standard material for TMS within the conditions tested in this research.
Key Words: suspended solis (SS), turbidity, recovery, coefficient of variation, correlation coefficient, TMS
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