Analysis and Evaluation for Drinking Water from Kitchens of Some Restaurants, Schools and Kindergartens in Henan Province

Objectives To know the quality of drinking water from the kitchens of restaurants, schools and kindergardens in Henan Province and provide authorities with the data for the water supervision.

Methods After sampling from the kitchens of restaurants, schools and kindergartens in 18 prefecture-level cities directly under Henan Province and 28 counties in the province, detect Pb, As, Hg, Cd, standard plate-count bacteria (SPCB), total coliforms (TC), thermotolerant coliform bacteria (TCB) and E. coli (EC) according to GB/T 5750-2006, then analyze with single factor index and evaluate according to GB 5749-2006.

Results 145 among 215 samples (67.44%) meet GB 5749-2006. Pb, As, Hg and Cd in all the samples pass GB 5749-2006. The rates of passing GB 5749-2006 for SPCB, TC, TCB and EC are 73.02%, 77.67%, 81.86% and 90.23% respectively with statistical significance(χ²=11.854, P=0.001). The rates of passing GB 5749-2006 for samples from big, middle and small restaurants, schools and kindergartens are 81.63%, 64.29%, 45.46%, 60.87% and 73.81% respectively with statistical significance(χ²=11.272, P=0.024). The rate of passing GB 5749-2006 for samples from centralized water supply(70.59%)is much more higher than that from non-centralized water supply(9.09%)with statistical significance(χ²=9.185, P=0.002).

Conclusions The rate of passing GB 5749-2006 for the drinking water from the kitchens in Henan Province is lower mainly because of microbe contaminations, especially the water from small restaurants and the non-centralized water supply.