### Why Generic COAs Reduce Buyer Trust In the global Shilajit trade, low-credibility suppliers frequently recycle static PDF certificates or state vague phrases like "100% heavy metal free." In analytical chemistry, no substance contains "zero" heavy metals; the scientific gold standard is **quantification below accredited limits of detection (LOD) via ICP-MS**. ### Key Analytical Markers Every Importer Must Verify #### 1. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) Ensure testing specifies exact parts per million (ppm) or parts per billion (ppb): - **Lead (Pb)**: Must be < 0.5 ppm to satisfy California Proposition 65 without warning labels. - **Arsenic (Inorganic As)**: Must be < 1.0 ppm. - **Cadmium (Cd)**: Must be < 0.3 ppm. - **Mercury (Hg)**: Must be < 0.1 ppm. #### 2. Fulvic Acid Quantification Method Different test methods yield drastically divergent numbers. A test using non-specific UV spectrophotometry can easily mischaracterize cheap lignosulfonate or synthetic additives as fulvic acid. Insist on **HPLC-UV or Lamar-AOAC modified methods** that distinctly measure biologically active fulvic complexes (typically 50% - 65% w/w in genuine high-grade resin).