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Descriptions of NTP Study Types
Descriptions of NTP Study Types
Home » Testing Information » Descriptions of NTP Study Types » Reproductive » Abstracts » Abstract for Repro Tox: Potassium Dichromate (Hexavalent)
The potential reproductive toxicity of potassium dichromate (hexavalent) was evaluated in Sprague-Dawley rats. Potassium dichromate (hexavalent) was administered at dose levels of 0, 15, 50, 100, and 400 ppm in the diet for nine weeks followed by an eight week recovery (potassium dichromate free) period. Interim necropsies occurred after 3, 6, and 9 weeks of administration and a terminal necropsy occurred following Week 17.
There were no treatment-related findings noted in mean body weights, water and feed consumption, oragan weights, micorscopic evaluation of the liver, kidneys, and ovaries, and hematology findings except for decreases in mean corpuscular volume (MCV) and mean corpuscular hemoglobin (MCH) values in the 400 ppm males and females. These decreases suggest a possible bone marrow/erythroid response. These values returned to normal levels following the recovery period.
Testicular cell counts for Sertoli nuclei and preleptotene spermatocyte counts in Stage X and XI did not reveal any differences between the treated groups and control.
Results of the study indicate that
potassium dichromate treatment did produce a slight hematopoietic
toxicity at the 400 ppm dose level based upon MCV and MCH values
in the 400 ppm animals. The no-observable-effect level (NOAEL)
was determined to be 100 ppm.
Report Date:December 16, 1996
Web page last updated on September 13, 2007
The National Institute of Environmental Health Sciences is one of the National Institutes of Health within the U.S. Department of Health and Human Services. The National Toxicology Program is headquartered on the NIEHS campus in Research Triangle Park, NC.