我國有四成地下水�(jiān)測較�
國土資源部日前發(fā)布的《國土資源公�(bào)》顯示,全國198個地市級行政區(qū)共有4929個地下水水質(zhì)�(jiān)測點(diǎn),其中綜合評�(jià)水質(zhì)呈較差級的監(jiān)測點(diǎn)�1999�,占40.6%,水�(zhì)呈極差級的監(jiān)測點(diǎn)�826�,占16.8%。主要超�(biāo)組分為鐵、錳、氟化物�“三氮”(亞硝酸鹽氮、硝酸鹽氮和銨氮�、總硬度、溶解性總固體、硫酸鹽、氯化物�,個別�(jiān)測點(diǎn)存在重(類)金屬�(xiàng)目超�(biāo)�(xiàn)��
在這些�(jiān)測點(diǎn)中,綜合評價(jià)�(jié)果為水質(zhì)呈優(yōu)良級的監(jiān)測點(diǎn)�580個,占全部監(jiān)測點(diǎn)�11.8%,水�(zhì)呈良好級的監(jiān)測點(diǎn)�1348個,�27.3%,水�(zhì)呈較好級的監(jiān)測點(diǎn)�176個,�3.6%。據(jù)了解,其中水�(zhì)綜合變化呈穩(wěn)定趨勢的�(jiān)測點(diǎn)�2974�,呈變好趨勢的監(jiān)測點(diǎn)�793�,占17%;呈變差趨勢的監(jiān)測點(diǎn)�910個,�19.5%??傮w來看,地下水水質(zhì)綜合變化趨勢以穩(wěn)定為主,呈變好趨勢和變差趨勢的監(jiān)測點(diǎn)比例相當(dāng)�
熱水管道泵廠� |