修改高锰酸盐指数参考

src/views/leftCompoents/popupComponents.vue

@@ -8,7 +8,7 @@
     <ul class="paramsList">
         <li class="value">
           <span>COD_Mn：{{dataList.cod}} mg/L</span>
-          <span class="upImg" v-show="dataList.cod > 20"></span> 
+          <span class="upImg" v-show="dataList.cod > 6"></span> 
         </li>
         <li class="value">
           <span>TN：{{dataList.tn}} mg/L</span>