Abstract
Soil tests for plant-available phosphorus (P) are suggested to provide offsite P analysis required to monitor P fertilizer application and reduce P losses to downstream water. However, procedural and cost limitations of current soil phosphate tests have restricted their widespread use and have made them accessible only in laboratories. This study proposes a novel paper-based reagentless electrochemical soil phosphate sensor to extract and detect soil phosphate using an inexpensive and simple approach. In this test, concentrated Mehlich-3 and molybdate ions were impregnated in filter paper, which served as the phosphate extraction and reaction zone, and was followed by electrochemical detection using cyclic voltammetry signals. Soil samples from 22 sampling sites were used to validate this method against inductively coupled plasma optical emission spectroscopy (ICP) soil phosphate tests. Regression and correlation analyses showed a significant relationship between phosphate determinations by ICP and the proposed method, delivering a correlation coefficient, r, of 0.98 and a correlation slope of 1.02. The proposed approach provided a fast, portable, low-cost, accessible, reliable, and single-step test to extract and detect phosphate simultaneously with minimum waste (0.5 mL per sample), which made phosphate characterization possible in the field.
Funder
Natural Sciences and Engineering Research Council
Subject
Electrical and Electronic Engineering,Biochemistry,Instrumentation,Atomic and Molecular Physics, and Optics,Analytical Chemistry
Reference40 articles.
1. Brady, N., and Weil, R. (2016). The Nature and Properties of Soil, Pearson Upper. [15th ed.].
2. Barber, S.A. (1995). Soil Nutrient Bioavailability: A Mechanistic Approach, John Wiley & Sons.
3. Efficiency of soil and fertilizer phosphorus use;FAO Fertil. Plant Nutr. Bull.,2008
4. Phosphorus: A limiting nutrient for humanity?;Curr. Opin. Biotechnol.,2012
5. Effects of N:P ratio and total nutrient concentration on stream periphyton community structure, biomass, and elemental composition;Limnol. Oceanogr.,2001
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献