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http://dx.doi.org/10.7850/jkso.2015.20.1.63

2010 Inter-laboratory Comparison Study on Nutrient Analysis in Seawater  

Moon, Cho-Rong (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Rho, Taekeun (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Kang, Dong-Jin (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Kahng, Sung-Hyun (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Cho, Sung Rok (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Kim, Eun-Soo (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Lee, Jung Moo (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Park, Eun Ju (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Shin, Jin-Sun (Ocean Observation & Operation Management Division, Korea Institute of Ocean Science & Technology)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.20, no.1, 2015 , pp. 63-70 More about this Journal
Abstract
An inter-laboratory comparison campaign on nutrient analysis in seawater was carried out in 2010. Sets of three sterilized seawater samples (Bottle 130, 131, 132) which have enough homogeneity and stability were distributed to 10 laboratories. Participants analyzed the nutrients in their own laboratories (nitrite, nitrate, phosphate, and silicate) at least 5 times and reported the results. Statistical treatments were applied to the results to assess the precision for each laboratory and the discrepancy among laboratories. Most laboratories show within 10% of precision in all nutrient results. Degrees of scattering described as discrepancy among laboratories and relative percent difference values were 4~63% and 0.04~2217%, respectively. The statistical analysis shows that the difference among the laboratories may due to the systematic error rather than random error. When the results were corrected by the results of bottle 130 as a reference material, the degrees of scattering and the relative percent difference were improved significantly. As a result, since most participants show satisfactory precision for nutrient analyses, a use of reference materials which have homogeneity and stability was strongly recommended to improve the comparability of nutrient data.
Keywords
Nutrients; Nutrient analysis in seawater; Inter-laboratory comparison; Reference Material;
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