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We demonstrate low-cost ozone and nitrogen dioxide measurement instruments suitable for use in an air quality monitoring network. The instruments are based on the gas response of tungstic oxide at elevated temperature. We have shown that with careful attention to detail, small, robust instruments can be made, with sensitivity for O3 and NO2 less than 10 part-per-billion (ppb), and which track reference...
Samples of 316 stainless steel have been subjected to passivation treatments at ambient temperature for 1 h in solutions of up to 50 wt% nitric acid. Pitting potentials of the treated samples were measured in 1 M NaCl at 70 o C and were shown to vary with the concentration of the pre-treatment; increasing with concentration up to 25 wt% and then decreasing as the acid concentration was further...
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