5. Analysis of the feasibility of screening indicators
Compared to 24 monitoring indexes in Table 1 of GB3838-2002, the quantity of screening indictors in
Table 5 is apparently less. Can the sole monitoring and evaluation of these indexes reflect the full picture
of the condition of water quality? In order to confirm the feasibility of the screening indicators, we take
the mainstreams of Liao River and Xiang River as an example, alongside with the single factor evaluation
method, evaluate the water body by using the 22 indexes in GB3838-2002 except for the water
temperature and total nitrogen ones together with the indexes screened in Table 5. The evaluation results
are listed in the Table 6 and Table 7 respectively.