ISCT works closely with our clients to help them determine what is the best approach to accomplish their objectives.  We use a variety of sampling and analytical methods for assessments of volatile metals and can collect and analyze multiple metals samples simultaneously from gas phase process streams.  Hydrocarbon fluids and aqueous samples are analyzed onsite using a combustion method but are more typically collected and run offsite at our laboratory for trace metals analysis using the principals of EPA 1630 and 1631.

Arsenic

• Volatile arsenic species are measured in process streams using a variation of EPA Method 30 B (EPA-30B) using silver nitrate impregnated silica gel sorbent traps, nitric acid digestion of the sorbent followed by Inductively Coupled Plasma – Mass Spectrometry (ICP-MS).

Selenium

• Se in process streams is measured using a similar modified EPA-30B sampling method and analyzed using hydride generation atomic fluorescence spectrometry (HG-AFS).

Mercury

• We frequently use a combination approach for mercury sampling and analysis in process streams – ASTM D-6350, ISO 6978 combined with EPA 30B – EPA 1631.

Mercury Speciation

• Molecular species are measured using selective speciation traps to quantitate dimethyl mercury (DMHg)

• Functional mercury species are measured using sequential selective capture sample traps to separate and quantify three mercury species, particulate Hg (PHg), gaseous oxidized (Hg(II)), and gaseous elemental (Hg0).