EtO Instrumentation Calibration and Surrogate Calibration Techniques

Written in response to a particular inquiry, this article is posted since it is of general interest. Calibration is a very important issue. One of Interscan’s competitors recommends calibrating its EtO monitor with CO (Carbon Monoxide). There is nothing wrong with using CO to calibrate an analyzer, assuming it is a CO analyzer that you…

Complying with 40 CFR Part 63 subpart WWWWW–National Emission Standards for Hospital Ethylene Oxide Sterilizers

Background In the continuing regulatory assault on ethylene oxide, more rules now apply. Fortunately, these latest statutes are not at all difficult to comply with. The new rule is called “National Emission Standards for Hospital Ethylene Oxide Sterilizers.” It was published on 28 December 2007 as 40 CFR Part 63, with particular notice given to…

Alcohols and Electrochemical Sensors

For any gas to be detectable by an electrochemical sensor, it must first be “electroactive.” As defined by the International Union of Pure and Applied Chemistry (IUPAC) Analytical Chemistry Division Commission on Electroanalytical Chemistry, an electroactive substance is… In voltammetry and related techniques, a substance that undergoes a change of oxidation state, or the breaking…

A rebuttal to the ChemDAQ vs. Interscan table from ChemDAQ’s website

ChemDAQ, a manufacturer of sterilant gas monitoring systems, has posted a pdf of a comparison matrix on its website, pitting their systems against ours. Fair enough. We felt it only proper to reproduce their table, adding a fourth column with our comments. Since the tabular format is not ideally suited to detailed remarks, a few…