Home / Standards / GB/T 20749-2006 GB/T 20749-2006 Active Method for determination of β-estradiol residues in bovine urine gas chromatography-negative-ion chemical ionization mass spectrometry method 牛尿中β-雌二醇残留量的测定 气相色谱-负化学电离质谱法 Standard Type GBT ICS N/A CCS X04 Status 现行 Issue Date 2006-12-31 Implementation 2007-03-01 Responsible Dept 农业农村部 Drafting Unit 农业农村部