各位大虾,小虫公司最近要为一家试剂厂商代加工一批HPLC级甲醇试剂,对方给出了以下的技术指标,但没有提供检测标准,请哪位大虾指点一下,特别是甲醇的梯度洗脱怎么来进行的。非常感谢!!
Assay (CH3OH) (by GC, corrected for water) 99.8 % min. 100.0 %
Ultraviolet Absorbance
(1.00-cm cell vs. water):
400-254 nm 0.01 max. 0.008
225 nm 0.15 max. 0.13
UV Cut-off, nm 205 max. 204
Gradient Elution Test (a.u.):
254 nm 0.002 max. < 0.001
Fluorescence Trace Impurities, in ppb, measured as Quinine Base:
at 450 nm Emission 0.3 max. 0.03
at Emission Maximum for Impurities 1.0 max. 0.08
Acetone 0.001 % max. 0.0003 %
Residue after Evaporation 1 ppm max. < 0.1 ppm
Titrable Acid (ueq/g) 0.3 max. 0.2
Titrable Base (ueq/g) 0.1 max. < 0.02
Water (by KF, coulometric) 0.05 % max. < 0.01 %
For Laboratory, Research or Manufacturing Use