| Summary: | A self-prepared test kit for outdoor dissolved oxygen determination was prepared and evaluated against the azide modification Winkler method. Three hundred and five water samples with 3 replicates were taken from ditches at Prince of Songkla University, Pattani campus. The result showed that the 2 methods had good correlation (r = 0.999, p < 0.00) with linear regression Y = 0.9992X + 0.0111 (p< 0.00). When paired t-test was performed, there was no statistically significant difference at p>0.05. Thus, the compact self-prepared test kit, based on azide modification Winkler method, was suitable for quick outdoor determination of dissolved oxygen and cost only one-eighth of the cost of the azide modification method.
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