| 质量标准： |
GB/T 9855-88
项目Item 优级纯 分析纯 化学纯
(GR) (AR) (CP)
含量(C6H8O7·H2O)Assay,% ≥ 99.8 99.5 99.0
澄清度试验Clarity 合格 合格 合格
水不溶物Insoluble matter in water,% ≤ 0.002 0.005 0.01
灼烧残渣(以硫酸盐计)Ignition residue,% ≤ 0.01 0.02 0.07
氯化物(Cl)Chloride,% ≤ 0.0005 0.0005 0.005
硫酸盐(SO4)Sulfate,% ≤ 0.002 0.005 0.02
磷酸盐(PO4)Phosphate,% ≤ 0.001 0.001 0.005
草酸盐(C2O4)Oxalate ≤ 0.05 0.05 --
钙(Ca)Calcium,% ≤ 0.002 0.005 0.02
铁(Fe)Iron,% ≤ 0.0003 0.0005 0.001
铜(Cu)Copper,% ≤ 0.0005 0.0005 --
铅(Pb)Lead,% ≤ 0.0005 0.0005 0.001
易碳化物质Readily earbonizable substances 合格 合格 --
项目 ACS级
(ACS)
含量Assay (C6H8O7•H2O) 99.0-102.0%
不溶物Insoluble Matter ≤ 0.005%
灼烧残渣Residue after Ignition ≤ 0.02%
氯Chloride (Cl) ≤ 0.001%
草酸盐试验Oxalate (C2O4) To pass test (limit about 0.05%)
磷酸盐Phosphate (PO4) ≤0.001%
硫酸盐Sulfur Compounds (as SO4) ≤0.002%
铁Iron (Fe) ≤3 ppm
铅Lead (Pb) ≤2 ppm
易碳化物质Substances Carbonizable by Hot Sulfuric Acid (Tartrates, etc.)
To pass test
品级Grade 药典级
(Ph. Eur., BP, USP, E330)
含量assay 99.5-100.5% (based on anhydrous substance)
红外光谱鉴别Infrared spectrometry Conforms
residual solvents, complies
heavy metals (as Pb) ≤0.0005%
water 7.5-8.8% (Karl Fischer)
ign. residue ≤0.05% (as SO4)
pKa (1) 3.13, (2) 4.76, (3) 6.4
痕量阴离子anion traces by ICP Atomic emission and AAS
chloride (Cl-): ≤50 ppm
oxalate (as oxalic acid): ≤100 ppm
sulfate (SO42-): ≤100 ppm
痕量阳离子cation traces by ICP Atomic emission
Al: ≤0.2 ppm
As: ≤1 ppm
Ca: ≤200 ppm
Cu: ≤10 ppm
Fe: ≤10 ppm
Hg: ≤1 ppm
Pb: ≤1 ppm
Zn: ≤10 ppm
suitability complies for appearance of solution
complies for reaction against H2SO4
99.9998% (metals basis) ：
含量assay ≥99.5% (T)
纯度Purity ≥99.9998% (metals basis)
total impurities
total nitrogen (N) ≤5 ppm
acetate ≤5000 ppb
formia te ≤5000 ppb
glycolate ≤5000 ppb
pKa (1) 3.13, (2) 4.76, (3) 6.4
anion traces
bromide (Br-): ≤2000 ppb
chloride (Cl-): ≤10000 ppb
fluoride (F-): ≥2000 ppb
iodide (I-): ≤2000 ppb
nitrate (NO3-): ≤10000 ppb
nitrite (NO2-): ≤2000 ppb
oxalate (C2O42-): ≤5000 ppb
phosphate (PO43-): ≤2000 ppb
sulfate (SO42-): ≤10000 ppb
tartrate (C4H4O62-): ≤0.2%
cation traces
Ag: ≤0.01 ppm
Al: ≤0.05 ppm
As: ≤0.01 ppm
Au: ≤0.01 ppm
Ba: ≤0.05 ppm
Be: ≤0.01 ppm
Bi: ≤0.01 ppm
Ca: ≤0.1 ppm
Cd: ≤0.01 ppm
Ce: ≤0.01 ppm
Co: ≤0.01 ppm
Cr: ≤0.05 ppm
Cs: ≤0.01 ppm
Cu: ≤0.01 ppm
Dy: ≤0.01 ppm
Er: ≤0.01 ppm
Eu: ≤0.01 ppm
Fe: ≤0.1 ppm
Ga: ≤0.01 ppm
Gd: ≤0.01 ppm
Ge: ≤0.01 ppm
Hf: ≤0.01 ppm
Hg: ≤0.005 ppm
Ho: ≤0.01 ppm
In: ≤0.01 ppm
Ir: ≤0.01 ppm
K: ≤0.1 ppm
La: ≤0.01 ppm
Li: ≤0.01 ppm
Lu: ≤0.01 ppm
Mg: ≤0.05 ppm
Mn: ≤0.01 ppm
Mo: ≤0.01 ppm
Na: ≤2 ppm
Nb: ≤0.01 ppm
Nd: ≤0.01 ppm
Ni: ≤0.01 ppm
Os: ≤0.01 ppm
Pb: ≤0.01 ppm
Pd: ≤0.01 ppm
Pr: ≤0.01 ppm
Pt: ≤0.01 ppm
Rb: ≤0.01 ppm
Re: ≤0.01 ppm
Rh: ≤0.01 ppm
Ru: ≤0.01 ppm
Sb: ≤0.01 ppm
Sc: ≤0.05 ppm
Se: ≤0.05 ppm
Sm: ≤0.01 ppm
Sn: ≤0.01 ppm
Sr: ≤0.01 ppm
Ta: ≤0.01 ppm
Tb: ≤0.01 ppm
Te: ≤0.01 ppm
Th: ≤0.01 ppm
Ti: ≤0.05 ppm
Tl: ≤0.01 ppm
Tm: ≤0.01 ppm
U: ≤0.01 ppm
V: ≤0.01 ppm
W: ≤0.01 ppm
Y: ≤0.01 ppm
Yb: ≤0.01 ppm
Zn: ≤0.01 ppm
Zr: ≤0.01 ppm
USP级
ASSAY (C6H8O7 ;ANHYD.,BASIS) 99.5 - 100.5 %
CLARITY OF SOLUTION TO PASS TEST
COLOR OF SOLUTION TO PASS TEST
WATER 7.5 - 9.0 %
RESIDUE ON IGNITION -- 0.1 %
READILY CARBONIZABLE SUBSTANCES -- TO PASS TEST
SULFATE -- 0.015 %
HEAVY METALS -- 0.001 %
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