一.色纯洁的水在水浅层时为无色,深时为浅蓝绿色,水中如含有杂质,则发生一些淡黄色甚至棕黄色。使水呈现色度的原因很多,如水中腐植质多时,常呈黄色;沼泽色呈灰黑色是因为植物中所含单宁酸及没食子酸盐与铁质化合成铁盐而造成的。低铁化合物使 A color pure water in the shallow water is colorless, dark blue light green, water, such as containing impurities, the occurrence of some light yellow or even brown. There are many reasons for the water to show chroma, such as humus water for a long time, often yellow; swamp color gray black is because the plant contains tannic acid and gallic acid iron and iron synthesis caused by iron. Low Iron Compound