Surface decontamination efficacy determination of DeconGel™ 1101 on stainless steel, porcelain tile, composite tile (unwaxed), linoleum tile, and concrete surfaces contaminated with mercury (elemental) was performed with Mercury Vapor Analysis Sensor (Mercury Tracker 3000) according to Environmental Protection Agency (EPA) SW-846 Method: 7471B: 'Mercury in Solid or Semisolid Waste (Manual Cold-Vapor Technique)'.
Hazardous Materials Relevance
Mercury is used in thermometers, electronics, lighting, gold and silver refinery, and combined with other metals to form useful amalgams. Mercury and most of its compounds are extremely toxic, causing neurological damage due to inhalation of vapors/dust or ingestion.
- As seen in Table 1, excellent to acceptable surface decontamination was achieved by applying DeconGel 1101 onto contaminated surfaces, resulting in encapsulation of mercury (elemental) by DeconGel's active components. Decontamination efficacies of poured DeconGel 1101 ranged from 66.0% (composite tile, using Zn-controlled contaminant loading) to 85.9% (porcelain tile, using Zn-controlled contaminant loading) to 90.8% (linoleum tile, using Zn-controlled contaminant loading) to 91.7% (composite tile, using pipet-controlled contaminant loading) to 95.4% (linoleum tile, using pipet-controlled contaminant loading) to 97.8% (concrete, using pipet-controlled contaminant loading) to 98.4% (stainless steel, using pipet-controlled contaminant loading) to 99.2% (porcelain tile, using pipet-controlled contaminant loading); decontamination efficacy of brushed DeconGel 1101 was 99.0% (linoleum tile, using Zn-controlled contaminant loading).
- Mercury (elemental) was evidenced to interact with most plastic surfaces such as un-waxed composite and linoleum tiles, adhering to the plastic surfaces and forming a fixed residue that was not able to be completely removed by DeconGel. Nevertheless, DeconGel showed excellent to acceptable decontamination efficacy of loose mercury (small beads • Optimized experimental and analytical methods were successfully developed following a standardized EPA analysis method as a guideline for determination of elemental mercury vapor on solid surfaces. When deemed necessary, experimental methods were customized to ensure accurate decontamination efficacy determination of DeconGel.
Table 1 shows the decontamination efficacies of DeconGel 1101 on stainless steel, concrete, porcelain tile, composite tile, and linoleum tile surfaces as determined by mercury vapor analysis.