【简答题】![](https://cos-cdn.shuashuati.com/shuashuati-web/2024-0521-0905-00/logo-new-ad743.png)
土壤有机质的测定: 取2个250mL三角瓶A和B,称取0.25mm烘干土壤样品0.1089g于三角瓶A中,向两个三角瓶中分别加入0.8M (1/6)重铬酸钾和浓H2SO4 各5ml ,置于沙浴中,并保持微沸,5分钟后取下,冷却后加邻啡罗啉指示剂5滴(1滴=0.05mL),并用 0.1796 mol/L 标准硫酸亚铁溶液滴定至砖红色,其中三角瓶A消耗硫酸亚铁溶液13.09mL。三角瓶B消耗硫酸亚铁溶液16.89 mL。求该土壤样品全碳含量和有机质含量(g/kg)。
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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