土壤与地下水中典型污染物的快速检测响应阈值
参照国内外相关文献报道，结合前期调查工作数据，制定了土壤与地下水中典型污染物（NAPLs、VOCs、可降解有机物、氨、汞、铅等）快速检测在不同污染程度下的响应阈值范围表（附表A）。其中无污染一般为环境背景；轻度污染一般表示存在污染物，但未超过国家管控标准；中度污染一般表示该污染浓度超过国家标准，需采取管控处理；重度污染一般表示污染源区。本表中的阈值范围会根据最新文献资料和微扰动调查数据进行更新，原则上每年更新一次。
附表A土壤与地下水中典型污染物的快速检测响应阈值范围表
|
典型污染物 |
测试项目 |
单位 |
无污染 |
轻度污染 |
中度污染 |
重度污染 |
|
NAPLs |
氡气 |
Bq/m3 |
200~2000 |
200~2000 |
200~2000 |
＜100~500 |
|
VOCs |
VOCs |
ppm |
0~0.1 |
0.05～1 |
0.5～10 |
＞5~10 |
|
可降解有机物 |
CO2 |
% |
0.04~0.5 |
0.2～1 |
0.5～5 |
＞2~10 |
|
O2 |
% |
20~21 |
18～20 |
15~19 |
＜18~10 |
|
|
CH4 |
% |
0~0.1 |
0.05～0.25 |
0.1~1 |
＞0.5~5 |
|
|
H2 |
ppm |
0~50 |
10～100 |
50~500 |
＞200~1000 |
|
|
H2S |
ppm |
0~0.5 |
0.1～1 |
0.5~5 |
＞2~10 |
|
|
氨 |
NH3 |
ppm |
0~2 |
0.1～5 |
2~10 |
＞5~20 |
|
汞 |
汞蒸气（Hg⁰） |
μg/m³ |
0~1 |
0.1~10 |
1~100 |
＞10~1000 |
|
铅 |
铅蒸气（Pb） |
μg/m³ |
0~0.2 |
0.02~2 |
0.2~20 |
＞2~200 |
注：
（1）本表给出适用于典型污染物微扰动快速检测场景的阈值范围，实际应用过程中，阈值需根据场地地层条件、温度、湿度等条件及前期调查数据，在阈值范围内调整。
（2）VOCs 值采用PID监测，检测值为苯当量浓度，其他VOCs需按响应系数折算。
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