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Nonvolatile residue inspection

Nonvolatile residue inspection

Q. What is a nonvolatile residue inspection? A.  Nonvolatile Residue Inspection (NVR) involves extraction of soil from a dirty surface into a solvent. The solvent is then evaporated onto a coupon of known weight.  After the solvent is evaporated off the coupon, any residue will be deposited on the coupon. The coupon is then re-weighed and […]

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