Adsorption and Recovery of Dissolved Organic Phosphorus and Nitrogen by Mixed‐Bed Ion‐Exchange Resin
Adsorption and Recovery of Dissolved Organic Phosphorus and Nitrogen by Mixed‐Bed Ion‐Exchange Resin
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混床离子交换树脂吸附回收溶解有机磷和氮
DOI：
10.2136/sssaj2003.8890
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发表时间：
2003
影响因子：
2.9
通讯作者：
G. Mehuys
中科院分区：
文献类型：
--
作者：
Jacques L. Langlois;Dale W. Johnson;G. Mehuys
进行了实验室研究，以考察使用各种混合床阴阳离子交换树脂吸收溶解的有机和无机N（DON和DIN）和P（DOP和DIP）的功效。白杨（Populus grandidentata）树叶的沥滤液通过含有尼龙袋中的三种品牌的混合床树脂的柱，通过用KCl冲洗对树脂进行预处理和不进行预处理。浸提后，用2 M KCl或2 M HCl萃取树脂，并计算DIN、DON、DIP和DOP的回收率。结果表明，各种树脂对DIP的吸附率（91-98.5%）均高于DOP（55-70%），对NO的吸附率（87-100%）高于NH（0-14%）和DON（18-49%）。一般而言，预处理树脂显著降低吸收。DIP和DOP的回收率受预处理和提取液的影响，而DIN和DON的回收率则因胺基的释放而存在问题。总体而言，混合床树脂的使用似乎足以用于P研究，但不适用于短时间尺度的N研究。N研究需要更长的暴露时间，因此信噪比（空白）比高于本研究。
A laboratory study was conducted to investigate the efficacy of using various mixed-bed anion-cation exchange resins in absorbing dissolved organic and inorganic N (DON and DIN) and P (DOP and DIP). Leachate from foliage of aspen (Populus grandidentata) was passed through columns containing three brands of mixed-bed resin contained in nylon bags, with and without pretreatment of the resins by rinsing with KCI. After leaching, the resins were extracted with either 2 M KCI or 2 M HCl, and recoveries of DIN, DON, DIP, and DOP were calculated. The results showed that all brands of resin adsorbed more DIP (91-98.5%) than DOP (55-70%) and more NO, (87-100%) than NH, (0-14%) and DON (18-49%). In general, pretreating the resin significantly decreased absorption. The recovery of DIP and DOP was influenced by the pretreatment and the extracting solution whereas the recovery of DIN and DON was problematic because of the release of amine groups. Overall, the use of mixed-bed resin seems adequate for P studies but not for N studies on a short-time scale. Longer exposure periods are needed for studies of N so that the signal/noise (blank) ratio is higher than in this study.