車用尿素設(shè)備國家標準(GB 29518-2013):
尿素含量(質(zhì)量分數(shù))% 31.8~33.2;密度(20℃)/(kg/m3) 1087.0~1093.0;
折光率(n) 1.3814~1.3843;
堿度(以NH3計)(質(zhì)量分數(shù))% ≤0.2;
縮二脲(質(zhì)量分數(shù))/% ≤0.3;
甲醛(以HCHO計)/(mg/kg) ≤5;
不溶物/(mg/kg) ≤20;
磷酸鹽(以PO4計)/(mg/kg) ≤0.5;
鈣(Ca)/(mg/kg) ≤0.5;
鐵(Fe)/(mg/kg) ≤0.5;
銅(Cu)/(mg/kg) ≤0.2;
鋅(Zn)/(mg/kg) ≤0.2;
鉻(Cr)/(mg/kg) ≤0.2;
鎳/(mg/kg) ≤0.2;
鋁(Al)/(mg/kg) ≤0.5;
鎂(Mg)/(mg/kg) ≤0.5;
鈉(Na)/(mg/kg) ≤0.5;
鉀(K)/(mg/kg) ≤0.5