Potassium sodium tartrate tetrahydrate

grade

puriss.

Quality Level

200

Assay

99.0-101.0% (calc. on H₂O free substance)

form

solid

optical activity

[α]20/D +28.0 to +30.0°

quality

meets analytical specification of Ph. Eur., BP, USP, FC, E 337

impurities

acidity or alkalinity, in accordance
residual solvent, complies
≤0.001% heavy metals (as Pb)
≤0.003% total nitrogen (N)
≤0.004% ammonium (NH₄)
≤0.004% free alkali (as NaOH)
≤0.0075% free acid (as C₄H₆O₆)
24-26% water (Karl Fischer)

loss

21-26% loss on drying, 150 °C, 3 h

pH

6.5-8.5 (20 °C, 1%)

anion traces

chloride (Cl^-): ≤20 mg/kg
sulfate (SO₄^2-): ≤50 mg/kg

cation traces

As: ≤1 mg/kg
Ba:, in accordance
Ca: ≤50 mg/kg
Cu: ≤10 mg/kg
Fe: ≤10 mg/kg
Hg: ≤1 mg/kg
Pb: ≤2 mg/kg
Zn: ≤10 mg/kg

suitability

passes test for appearance of solution

SMILES string

O.O.O.O.[Na+].[K+].O[C@H]([C@@H](O)C([O-])=O)C([O-])=O

InChI

1S/C4H6O6.K.Na.4H2O/c5-1(3(7)8)2(6)4(9)10;;;;;;/h1-2,5-6H,(H,7,8)(H,9,10);;;4*1H2/q;2*+1;;;;/p-2/t1-,2-;;;;;;/m1....../s1

InChI key

VZOPRCCTKLAGPN-ZFJVMAEJSA-L