Full
Outline
Fertilizer directly affects crop yield by regulating plant growth and development, and it is an important factor in promoting modern intensive agriculture for high yield and quality of crops. However, urea and urea containing compound fertilizers are prone to produce byproducts such as biuret. Currently, the high content of biuret in fertilizers causes crop toxicity in farmland, which cannot be ignored. Therefore, it is of practical significance to establish an efficient method for detecting biuret in fertilizers, ensuring the safety of fertilizer production and promoting the green and high-quality development of agriculture in China. This research is based on the urgent demand for high-quality fertilizers in the development of modern agriculture in China, and a sensitive electrochemical sensing interface based on carbon-based structural materials is constructed to achieve online and rapid evaluation of biuret in fertilizers and effectively overcomes the shortcomings of liquid chromatography and UV spectrophotometry, such as cumbersome sample pretreatment, high analysis cost, and large sample turbidity interference. During the electrochemical assay, a graphene-nanogold composite is firstly prepared as a sensing interface modification material, which combines the surface characteristics of carbon-based structure with the excellent conductivity of nanogold; Secondly, based on the inhibitory effect of biuret on electrochemical signal of copper ions, a linear regression equation is established for the response current of copper ions with the variation of biuret concentration. With the help of a smartphone obtaining electrochemical signal, rapid electrochemical analysis of biuret is achieved. The experimental results demonstrate that there is a good linear relationship between the response current generated by copper ions and the concentration of biuret in the range of 1-80 mmol/L, with a detection limit of 0.50 mmol/L (S/N=3); The electrochemical sensing system is used for the analysis of biuret in fertilizer samples, and the relative errors between the detection results and those by high-performance liquid chromatography do not exceed 6.9%. Overall, this electrochemical method is applied to the online detection of biuret in fertilizers with high portability, reliability, and accuracy, aiming for technological innovation empowering crops with high yield and quality.
26
6
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
