Quality Standard:   	品级Grade                               色谱纯  
                                      (HPLC grade)
外观Appearance                          白色结晶粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity(以干基计)                  ≥98.0% (Ion exchange titration)
纯度Purity                              ≥98.0% (HPLC,蒸发光检测器)  
水分Water                               <2 %
λ C=0.25 M in water
紫外吸光值UV absorption  
200 nm A:                              <0.3
210 nm A:                              <0.2
220 nm A:                              <0.1
230 nm A:                              <0.075
240 nm A:                              <0.05
250 nm A:                              <0.05
260 nm A:                              <0.04
(0.25 M aqueous solution)
品级Grade                               离子对试剂  
                                    (for ion pair chromatography)
外观Appearance                          白色结晶粉末
红外光谱鉴别Infrared spectrometry       Conforms
纯度Purity(以干基计)                  ≥99.0% (Ion exchange titration)  
干燥损失Loss on drying                  <2 % (150°C)
λ C=0.33 M in water
紫外吸光值UV absorption
210 nm A:                              <0.08  
220 nm A:                              <0.05  
230 nm A:                              <0.03  
260 nm A:                              <0.02
500 nm A:                              <0.02
RP梯度测试RP gradient test              Passes
膜过滤测试Membrane filtration test      Passes test on 0.4 M sol