所謂化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)（COD），是在(zai)一(yi)(yi)(yi)定(ding)(ding)(ding)(ding)的(de)條件(jian)下，采用(yong)一(yi)(yi)(yi)定(ding)(ding)(ding)(ding)的(de)強氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)劑(ji)處理水(shui)樣時，所消耗的(de)氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)劑(ji)量(liang)(liang)(liang)(liang)(liang)(liang)。它是表示水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)還原性(xing)(xing)(xing)物(wu)(wu)(wu)質(zhi)多少的(de)一(yi)(yi)(yi)個指標(biao)。水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)的(de)還原性(xing)(xing)(xing)物(wu)(wu)(wu)質(zhi)有(you)(you)(you)各種有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)、亞硝酸(suan)(suan)(suan)鹽、硫化(hua)(hua)(hua)(hua)物(wu)(wu)(wu)、亞鐵鹽等，但(dan)主要的(de)是有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)。因此，化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)（COD）又往往作為衡量(liang)(liang)(liang)(liang)(liang)(liang)水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)質(zhi)含(han)量(liang)(liang)(liang)(liang)(liang)(liang)多少的(de)指標(biao)。化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)越(yue)大，說明水(shui)體(ti)受有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)的(de)污染越(yue)嚴(yan)重(zhong)(zhong)。化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)（COD）的(de)測(ce)(ce)定(ding)(ding)(ding)(ding)，隨(sui)著(zhu)測(ce)(ce)定(ding)(ding)(ding)(ding)水(shui)樣中(zhong)(zhong)(zhong)(zhong)(zhong)還原性(xing)(xing)(xing)物(wu)(wu)(wu)質(zhi)以(yi)及測(ce)(ce)定(ding)(ding)(ding)(ding)方(fang)法(fa)(fa)的(de)不同，其測(ce)(ce)定(ding)(ding)(ding)(ding)值也(ye)有(you)(you)(you)不同。應用(yong)普遍的(de)是酸(suan)(suan)(suan)性(xing)(xing)(xing)高錳(meng)(meng)酸(suan)(suan)(suan)*氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)法(fa)(fa)與重(zhong)(zhong)鉻酸(suan)(suan)(suan)*氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)法(fa)(fa)。高錳(meng)(meng)酸(suan)(suan)(suan)*（KMnO4）法(fa)(fa)，氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)率較(jiao)低，但(dan)比較(jiao)簡便，在(zai)測(ce)(ce)定(ding)(ding)(ding)(ding)水(shui)樣中(zhong)(zhong)(zhong)(zhong)(zhong)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)含(han)量(liang)(liang)(liang)(liang)(liang)(liang)的(de)相對比較(jiao)大時，可以(yi)采用(yong)重(zhong)(zhong)鉻酸(suan)(suan)(suan)*（K2Cr2O7）法(fa)(fa)，氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)率高，再現性(xing)(xing)(xing)好(hao)，適用(yong)于(yu)(yu)測(ce)(ce)定(ding)(ding)(ding)(ding)水(shui)樣中(zhong)(zhong)(zhong)(zhong)(zhong)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)的(de)總量(liang)(liang)(liang)(liang)(liang)(liang)。有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)對工業(ye)水(shui)系(xi)統(tong)的(de)危害很大。嚴(yan)格的(de)來說，化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)也(ye)包括(kuo)了水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)存在(zai)的(de)無機(ji)(ji)(ji)(ji)性(xing)(xing)(xing)還原物(wu)(wu)(wu)質(zhi)。通(tong)常(chang)，因廢(fei)水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)的(de)數(shu)量(liang)(liang)(liang)(liang)(liang)(liang)大大多于(yu)(yu)無機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)質(zhi)的(de)量(liang)(liang)(liang)(liang)(liang)(liang)，因此，一(yi)(yi)(yi)般用(yong)化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)來代表廢(fei)水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)質(zhi)的(de)總量(liang)(liang)(liang)(liang)(liang)(liang)。在(zai)測(ce)(ce)定(ding)(ding)(ding)(ding)條件(jian)下水(shui)中(zhong)(zhong)(zhong)(zhong)(zhong)不含(han)氮(dan)的(de)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)質(zhi)易被(bei)高錳(meng)(meng)酸(suan)(suan)(suan)*氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)，而(er)含(han)氮(dan)的(de)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)質(zhi)就(jiu)比較(jiao)難分解。因此，耗氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)適用(yong)于(yu)(yu)測(ce)(ce)定(ding)(ding)(ding)(ding)天然(ran)水(shui)或含(han)容易被(bei)氧(yang)(yang)(yang)(yang)化(hua)(hua)(hua)(hua)的(de)有(you)(you)(you)機(ji)(ji)(ji)(ji)物(wu)(wu)(wu)的(de)一(yi)(yi)(yi)般廢(fei)水(shui)，而(er)成(cheng)分較(jiao)復雜的(de)有(you)(you)(you)機(ji)(ji)(ji)(ji)工業(ye)廢(fei)水(shui)則(ze)常(chang)測(ce)(ce)定(ding)(ding)(ding)(ding)化(hua)(hua)(hua)(hua)學需氧(yang)(yang)(yang)(yang)量(liang)(liang)(liang)(liang)(liang)(liang)。

COD水質多參數檢測儀LB-4020產品特點

1． 5寸電阻(zu)式觸控屏顯(xian)示器，純(chun)中(zhong)文操作(zuo)界面，人性化(hua)的程序設(she)計(ji)；

2． 1至7點校正模式(shi)，自(zi)動計算斜率、截距及相關系數，測量精度高；

3． 大容量數據存儲，斷電保護設計確保儀器不受(shou)損壞和數據記錄丟(diu)失；

4． 抗干擾能力強，適(shi)用(yong)于工業現場；

5． 廣泛應用于地表水和污染源(yuan)的(de)監(jian)控；

6． 的半導(dao)體冷光源發(fa)光器，光源壽命可達幾萬小時；

7． 用U盤(pan)導出數據，操作簡單，攜(xie)帶方便；

8． 試劑用(yong)量少，運行成(cheng)本低，抗干擾能力(li)強。

COD水質多參數檢測儀LB-4020技術參數