Sodium Hydroxide solution 40% w/w for the determination of nitrogen

Sodium Hydroxide solution 40% w/w for the determination of nitrogen
Content: 10 LTR
Physical Description:
liquid
caustic , absorbs CO2 from air
Quality Name: for the determination of nitrogen
Specification: Minimum assay (Acidim.): 40%

?maximum limit of impurities:
Nitrogen compounds (as N): 0.002%
Carbonate (as Na2CO3): 1.0%