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Implementing Blanks and Standards
Proper insertion and evaluation of blanks and standards is critical for data quality. Blank Sample Protocol Material Selection - Use certified barren material - Match matrix to sample type e.g., silica sand for gold programs - Source from reputable suppliers Insertion Strategy - Insert after high-grade samples - Randomize positions within batches - Target 5% of total samples Evaluation Blanks should return values below 3-5x detection limit. Failures indicate contamination. Standard Protocol CRM Selection - Choose standards matching expected grade ranges - Use 2-3 different grade levels - Ensure certified values with acceptable uncertainty Evaluation Plot standard results vs. certified value. Results should fall within 2 standard deviations.