Chemical speciation and fate of tripolyphosphate after application to a calcareous soil

IF 0.9 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
Jordan G. Hamilton, Jay Grosskleg, David Hilger, Kris Bradshaw, Trevor Carlson, Steven D. Siciliano, Derek Peak
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引用次数: 23

Abstract

Adsorption and precipitation reactions often dictate the availability of phosphorus in soil environments. Tripolyphosphate (TPP) is considered a form of slow release P fertilizer in P limited soils, however, investigations of the chemical fate of TPP in soils are limited. It has been proposed that TPP rapidly hydrolyzes in the soil solution before adsorbing or precipitating with soil surfaces, but in model systems, TPP also adsorbs rapidly onto mineral surfaces. To study the adsorption behavior of TPP in calcareous soils, a short-term (48?h) TPP spike was performed under laboratory conditions. To determine the fate of TPP under field conditions, two different liquid TPP amendments were applied to a P limited subsurface field site via an in-ground injection system. Phosphorus speciation was assessed using X-ray absorption spectroscopy, total and labile extractable P, and X-ray diffraction. Adsorption of TPP to soil mineral surfaces was rapid (<?48?h) and persisted without fully hydrolyzing to ortho-P. Linear combination fitting of XAS data indicated that the distribution of adsorbed P was highest (~?30–40%) throughout the site after the first TPP amendment application (high water volume and low TPP concentrations). In contrast, lower water volumes with more concentrated TPP resulted in lower relative fractions of adsorbed P (15–25%), but a significant increase in total P concentrations (~?3000?mg?P?kg?soil) and adsorbed P (60%) directly adjacent to the injection system. This demonstrates that TPP application increases the adsorbed P fraction of calcareous soils through rapid adsorption reactions with soil mineral surfaces.

Abstract Image

三聚磷酸盐施于钙质土壤后的化学形态和命运
吸附和沉淀反应通常决定了土壤环境中磷的有效性。三聚磷酸盐(TPP)被认为是磷含量有限的土壤中缓释磷肥料的一种形式,然而,对TPP在土壤中的化学命运的研究有限。有人提出,TPP在土壤溶液中迅速水解,然后与土壤表面吸附或沉淀,但在模型系统中,TPP也迅速吸附到矿物表面。为了研究TPP在钙质土壤中的吸附行为,在实验室条件下进行了短期(48?h) TPP峰值实验。为了确定TPP在现场条件下的命运,通过地下注入系统将两种不同的液体TPP修正剂应用于P有限的地下油田。利用x射线吸收光谱、总磷和不稳定可萃取磷以及x射线衍射来评估磷的形态。TPP在土壤矿物表面的吸附速度很快(48 h),并且在未完全水解为邻磷的情况下持续存在。XAS数据的线性组合拟合表明,第一次施用TPP修正剂(高水量和低TPP浓度)后,整个站点的P吸附分布最高(~ 30-40%)。相比之下,水体积越小,TPP浓度越高,吸附磷的相对含量越低(15-25%),但总磷浓度(~ 3000 mg P / kg土壤)和吸附磷(60%)显著增加。这表明,施用TPP通过与土壤矿物表面的快速吸附反应,增加了钙质土壤的P吸附分数。
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来源期刊
Geochemical Transactions
Geochemical Transactions 地学-地球化学与地球物理
CiteScore
3.70
自引率
4.30%
发文量
2
审稿时长
>12 weeks
期刊介绍: Geochemical Transactions publishes high-quality research in all areas of chemistry as it relates to materials and processes occurring in terrestrial and extraterrestrial systems.
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