blank value

in analysis
https://doi.org/10.1351/goldbook.B00679
A @R05189@ or result originating from the matrix, reagents and any residual @B00639@ in the measurement device or process, which contributes to the value obtained for the quantity in the analytical procedure.
Sources:
PAC, 1989, 61, 1657. (Nomenclature for automated and mechanised analysis (Recommendations 1989)) on page 1662 [Terms] [Paper]
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2176 [Terms] [Paper]