(1991)

**** (2007)

****!!!!****!!!!**** (1991) {Is this back-up method? Or actually fully validated?} "Collection devide: An air sample is collected using a calibrated sampling pump and a midget fritted glass bubbler. The bubbler contains a collection solution of 0.02% potassium iodide (KI) in a sodium carbonate/sodium bicarbonate buffer." "Analytical Procedure: In the weakly basic solution, chlorine dioxide reacts with KI to form chlorite (ClO2¯) which is then determined by an ion chromatograph equipped with a conductivity detector and gradient pump." "The stock standard should be standardized at least monthly. It was noted during testing that this standard solution decreases in concentration approximately 4% per month. No significant difference in results was noted when sampling at different humidities. As shown in the mixture study, Cl2 does not interfere with the sampling or ion chromatographic analysis of ClO2 at the concentrations tested. Although a resultant 10% decrease in ClO2 and 7% increase in Cl2 concentrations occurred, this could have been due to the difficulty in generating both gases simultaneously. A mixture of ClO2 and Cl2 can be collected and analyzed together; however,Cl2 measurements are considered for screening purposes only. Further work is necessary to validate the KI/buffer sampling and IC analysis for Cl2.Detection limits are adequate if samples are taken for 240 min at 0.5 L/min"

EPA Science Models and Research Tools (SMaRT) Search searches ORD's methods, models, and tools database.

The software-based tool “ToxRTool” (Toxicological data Reliability Assessment Tool) provides comprehensive criteria and guidance for evaluations of the inherent quality of toxicological data, thus making the decision process of assigning reliability categories more transparent and harmonised. ToxRTool consists of two parts, one to evaluate in vivo and one to evaluate in vitro data.The primary result of the tool is the assignment of Klimisch categories 1, 2 or 3 (Klimisch et al., 1997). Additionally, the tool offers the option to assign a Klimisch category according to personal judgement.

{Extremely large collection of wide variety of searchable Data sheets, maps, etc. on environmental, health and other topics} "EnviroAtlas provides geospatial data, easy-to-use tools, and other resources related to ecosystem services, their chemical and non-chemical stressors, and human health. "

{Related to Predictive Models and Tools for Assessing Chemicals under the Toxic Substances Control Act (TSCA)} Providing quantal response models, which are also used in the U.S. EPA benchmark dose software suite, and generates a model-averaged dose response model to generate benchmark dose and benchmark dose lower bound estimates.