A Case Study

“Delphi Research lab was using chromic acid to treat glassware stains. In 1995, the company switched to a non-chromium based cleaner (NOCHROMIX®). The benefits that the company gained from this switch include improved worker safety, lower disposal costs, reduced environmental liability, and improved employee morale.”

Reprinted with permission from Analytical Laboratory “Code of Practice”, p. 47, City of Albuquerque, Public Works Dept/Pollution Prevention Program, 1998


USES


NOCHROMIX® is a white crystalline, inorganic oxidizer packaged in pre-measured, hermetically sealed pouches. When mixed with sulfuric acid, it forms a clear, strong cleaning solution that:

  • Chemically cleans glassware without leaving residue on the glass surface (neither detergent film nor heavy metal residues);
  • Removes stubborn stains, deposits and silicones from glassware;
  • Rinses freely, reducing rinsing time.

NOCHROMIX® is ideal for basic research, educational, biochemical, clinical chemistry and trace analysis laboratories. It is recommended by the ASTM for certain glass cleaning procedures, and suggested for for use by the US EPA and “Standard Methods for the Examination of Water and Waste Water”.

ADVANTAGES


NOCHROMIX® is a metal free cleaning solution that offers many benefits to all chemical or biological laboratories, but it is especially is useful where living cells and enzymes or trace metal analysis are involved. Chromium compounds are highly toxic to cells and enzymes.

NOCHROMIX®:

  • Does not contain metal ions or toxic heavy metal residues that absorb to the glass surface and cause possible interference with precision measurements in biological enzymes and other reactions.
  • Assures true and consistent test results.
  • Unlike chromium, NOCHROMIX® does not contain metals, simplifying disposal of spent cleaning solution.
  • NOCHROMIX® contains no known carcinogens. Dichromates, on the other hand, can be carcinogenic and a serious toxic hazard when in contact with chlorides or inorganic ions.

REFERENCES


  • ASTM: “Annual Book of ASTM Standards”, Vol. 05.04, Designation D6594-00, section 7.6, 8.1.4.1, p. 4, 2001
  • Lenore S Clesceri, et al. (eds): “Standard Methods for the Examination of Water and Wastewater”, 20th ed. (1998), section 2-20
  • US Environmental Protection Agency: “Handbook for Analytical Quality Control in Water and Wastewater Laboratories”, EPA-600/4-79-019, 4-5, March 1979
  • E.B. Butler and W.H. Johnson, “Retention of Chromium by Glass Following Treatment with Cleaning Solution”, Science 120 (1954), 543-544