Abstract:

The pH and conductivity data measured automatically and artificially from five acid rain observation stations in Shanxi province were analyzed to evaluate the discrepancy between the two observation methods.The results show that the precipitation sampling of the five stations is normal during parallel observation, the missing rate of automatic observation is 3.6%, and the trouble-free operation time of the instrument reaches 99.0%.In terms of pH measurement, 86.9% of non-acid rain (pH>5.6) was observed artificially during the study, which was lower than that of automatic observation (91.5%).The proportion of observation times with the relative pH deviation of manual and automatic observation values within 20% was 91.25%.For the measurement of the conductivity K value, the number of observations with a deviation between the two methods within 20% accounted for 64.1%.The linear correlation between artificial and automatic measurements of electrical conductivity at the five observation stations is significantly higher than that of pH.In general, the operation of the instrument is relatively reliable, but there are still some discrepancies between the artificial and automatic observations during parallel observation.Therefore it is recommended to extend the parallel observation time.

Key words: Acid rain, Conductivity Comparison