The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces.
The stable oxygen isotope ratio of resin extractable phosphate derived from fresh cattle faeces.
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DOI：
10.1002/rcm.8092
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发表时间：
2018-05-15
期刊：
影响因子：
--
通讯作者：
Howden NJK
中科院分区：
文献类型：
--
作者：
Granger SJ;Yang Y;Pfahler V;Hodgson C;Smith AC;Le Cocq K;Collins AL;Blackwell MSA;Howden NJK
农业中的磷流失对水道构成了环境威胁。利用氧在磷酸盐中的稳定氧同位素比值(δ18OPO4值)可能有助于阐明某些磷的来源和循环。准确确定和同位素上不同的源值是这一过程的关键。到目前为止，动物排泄物的δ18OPO4值几乎没有受到关注。用阴离子树脂从牛粪中提取磷酸盐(PO4)，并对微生物PO4的贡献进行了评估。提取的PO4的δ18OPO4值是通过磷酸银沉淀，然后在1400°C的热转换元素分析仪上进行分析，生成的一氧化碳与氦载气混合，通过气相色谱(GC)柱进入质谱仪来测量的。通过顶空二氧化碳与水样的平衡过程，在双进气质谱计上测定了粪便水的氧同位素比值(δ18OH2O值)。微生物学结果表明，大部分提取的PO4不是直接来自从粪便中提取PO4的过程中分解的肠道动物。假设粪便δ18OH2O代表牛体水，则预测的焦磷酸酶平衡δ18OPO4(Eδ18OPO4)值在+17.9‰到+19.9‰之间，而利用地下水δ18OH2O值给出的范围是+13.1到+14.0‰。粪便中δ-18OPO_4值在+13.2~+15.3‰之间。新鲜的粪便δ18OPO4值与其他地方报道的农业动物泥浆的值相当。然而，它们与由粪便δ18OH2O计算的Eδ18OPO4值不同。我们的结果表明，泥浆PO4主要来自动物粪便，尽管无法确定对观察值范围的解释。
Phosphorus losses from agriculture pose an environmental threat to watercourses. A new approach using the stable oxygen isotope ratio of oxygen in phosphate (δ18OPO4 value) may help elucidate some phosphorus sources and cycling. Accurately determined and isotopically distinct source values are essential for this process. The δ18OPO4 values of animal wastes have, up to now, received little attention. Phosphate (PO4) was extracted from cattle faeces using anion resins and the contribution of microbial PO4 was assessed. The δ18OPO4 value of the extracted PO4 was measured by precipitating silver phosphate and subsequent analysis on a thermal conversion elemental analyser at 1400°C, with the resultant carbon monoxide being mixed with a helium carrier gas passed through a gas chromatography (GC) column into a mass spectrometer. Faecal water oxygen isotope ratios (δ18OH2O values) were determined on a dual‐inlet mass spectrometer through a process of headspace carbon dioxide equilibration with water samples. Microbiological results indicated that much of the extracted PO4 was not derived directly from the gut fauna lysed during the extraction of PO4 from the faeces. Assuming that the faecal δ18OH2O values represented cattle body water, the predicted pyrophosphatase equilibrium δ18OPO4 (Eδ18OPO4) values ranged between +17.9 and +19.9‰, while using groundwater δ18OH2O values gave a range of +13.1 to +14.0‰. The faecal δ18OPO4 values ranged between +13.2 and +15.3‰. The fresh faecal δ18OPO4 values were equivalent to those reported elsewhere for agricultural animal slurry. However, they were different from the Eδ18OPO4 value calculated from the faecal δ18OH2O value. Our results indicate that slurry PO4 is, in the main, derived from animal faeces although an explanation for the observed value range could not be determined.
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DOI：
10.1080/00288233.1973.10421125
发表时间：
1973-01-01
影响因子：
1.8
作者：
DURING, C;WEEDA, WC
通讯作者：
WEEDA, WC
影响因子：
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影响因子：
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影响因子：
2
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影响因子：
5
作者：
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