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PACKTEST 化學(xué)需氧量

時(shí)間:2021-5-16閱讀:400
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測(cè)量原理常溫堿性高錳酸鉀氧化法
測(cè)量刻度0, 5, 10, 13, 20, 50, 100 mg/L
測(cè)量時(shí)間水溫10℃:6 分、水溫20℃:5 分、水溫30℃:4 分
是否可在海水中使用反應(yīng)速度更快,讀取值有偏高的傾向。標(biāo)準(zhǔn)色紙上的讀值的半刻度至1個(gè)刻度下的值為近似值。
當(dāng)COD值達(dá)到8mg/L以上時(shí),顏色可能會(huì)消失,變成無(wú)色。
內(nèi)容物軟管 50個(gè) (5個(gè)裝的層壓袋 10包), 保存袋 1個(gè), 標(biāo)準(zhǔn)色紙 (盒裝) 1個(gè), 使用說(shuō)明 1張
包裝外形165L × 110W × 65H mm
包裝重量大約 140 g

COD is an abbreviation for Chemical Oxygen Demand. There are various methods for measuring COD, that differ in oxidizing agent, reaction time, and reaction temperature; and each method has different oxidizing ratio depending on the type and concentration volume of oxidizable substances. In Japan, standard procedure for using the potassium permanganate method (COD-Mn) indicated in JIS K 0102 17. carried out in acidic medium for 30 min in water bath (100℃) is generally used, but PACKTEST COD utilizes JIS K 0102 19. using the alkaline medium (COD-OH) for presenting the advantage of fast and simple method. Alkaline medium method for JIS, the amount of potassium permanganate consumed in a boiling water bath for 20 min is determined by titration. On the other hand, PACKTEST COD determines the value by change of colors which potassium permanganate is consumed at ordinary temperature. The standard protocol uses glucose for standard solution. Water from the river may have good correlation with official COD-Mn method, but most of the oil, detergents, and other solids do not. When using PACKTEST for wastewater, please check correlation with official method, like JIS in Japan, for better reading.

 

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