DL 422.4-1991
HB 5220.33-2008
Methods for chemical analysis of superalloys-Part 33:Determination of niobium content by tetraphenyl arsonium chloride hydrochloride gravimetric method
DB53/T 842-2017
T/QGCML 2622-2023
32011R0574
32011R0574R(02)
ISO 906:1976
Hydrochloric acid for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
32011R0574R(04)
32011R0574R(03)