Blend Essential Oil,Star Anise Oil,Jasmine Oil,Essential Oil Kits Ji'An ZhongXiang Natural Plants Co.,Ltd. , https://www.zxessentialoil.com8120 Chlorinated hydrocarbons 8150 Chlorinated herbicides 8270 Gas chromatography-mass spectrometry (capillary column technology) of semi-volatile organic compounds 8310 Polycyclic aromatic hydrocarbons 9045 Soil pH 9070 Recoverable oils and fats (separating funnel extraction, gravimetric method) 9071 Extraction of oil and fat from sludge samples 9080 Soil cation exchange capacity (ammonium acetate method) 9081 Soil cation exchange capacity (sodium acetate method) 9131 total E. coli (multi-tube fermentation technology) 9132 total E. coli (filter membrane technology) 9310 total α and total β