Soxhlet extraction method was modified for determination of oil content with combination of condensatewater system at constant temperature. The optimal temperature of condensate water was at 15 °C constantly. Modified method showed significant improvement on accuracy and sensitivity, and has less discrepancy in different seasons and surrounding temperatures. From 2007 to 2010, according to the International Laboratory Comparison on Determination of Oilseed, results of modified soxhlet extraction method illustrated excellent consistency with the other 35 international authoritative oil testing laboratories, and showed that the ∣Z∣ values were less than 2. Additionally, with the modified soxhlet extraction method, Z values decreased from - 1. 98--0. 12 to -0. 60 ~0. 20, and relative deviationdecreased from -2.5%--0.38% to -1.24% -0.24% , which suggedted that these test results of modified method reached international standards.
国家科技期刊平台
NSTL
万方数据
维普
