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Method for measuring organic carbon and total nitrogen in soil

A technology for the determination of organic carbon and nitrogen, which is applied in the direction of analyzing materials through chemical reactions and analyzing materials through observation of the impact on chemical indicators. It can solve problems such as environmental pollution and high cost of experimental waste liquid treatment, and achieve improvement Effects of reaction temperature, reliable measurement results, and extended reaction time

Active Publication Date: 2019-06-21
FUJIAN HAIXIA ENVIRONMENTAL PROTECTION GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its disadvantages are: this method uses 5ml potassium dichromate solution and 7.5ml concentrated sulfuric acid in the pretreatment, considering that the waste liquid will pollute the environment after the potassium dichromate standard solution is used, and the cost of experimental waste liquid treatment higher

Method used

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  • Method for measuring organic carbon and total nitrogen in soil
  • Method for measuring organic carbon and total nitrogen in soil
  • Method for measuring organic carbon and total nitrogen in soil

Examples

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Embodiment 1

[0037] A method for measuring organic carbon and total nitrogen in soil, comprising the following steps:

[0038] Step S1 pretreatment: Accurately weigh 0.2-0.5g of the soil sample that has been air-dried and ground into powder and passed through an 80-mesh sieve into a 50mL colorimetric tube, add 1mL of 0.27mol / L potassium dichromate solution and 4mL of concentrated sulfuric acid, open the cap, and Add a small funnel with a curved handle at the mouth, preheat to 180°C, and digest in an oven at a constant temperature for 60 minutes. After the reaction is completed, take it out, cool to room temperature, add ammonia water to make up to the mark; carry out a blank test simultaneously.

[0039] The mensuration of step S2 organic carbon:

[0040] Step S21: Shake the above-mentioned digested solution to a constant volume, accurately pipette 10 mL into a centrifuge tube, and take the supernatant after centrifugation to measure the absorbance value at a wavelength of 585 nm, and simu...

example 1

[0064]

[0065] Soil organic carbon adopts different soil standard samples through multiple parallel sample determination results as follows table 1: (%)

[0066] Sample serial number GSS-3 GSS-4 GSS-6 GSS-7 GSS-33 measured value 1 0.50 / 0.82 0.65 / measured value 2 / / 0.90 0.61 / measured value 3 / / 0.89 0.68 / measured value 4 / / 0.87 0.70 / measured value 5 / / 0.75 / / standard value 0.55±0.05 0.65±0.10 0.81±0.09 0.67±0.09 0.55±0.5

[0067] The results of soil total nitrogen using different soil standard samples through multiple parallel samples are shown in Table 2: unit mg / kg

[0068] Sample serial number GSS-3 GSS-4 GSS-6 GSS-7 GSS-33 measured value 1 680 / 798 653 / measured value 2 692 / 742 691 / measured value 3 / / 722 629 / measured value 4 / / 682 639 / measured value 5 / / 635 640 / standard value 640±5...

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Abstract

The invention relates to the technical field of soil detection service and in particular to a method for measuring organic carbon and total nitrogen in soil. The method comprises steps of after the organic carbon in the soil is measured, completely transferring a remaining solution after the measurement of the organic carbon to a distillation tube; adding 0.2g of Devardas alloy powders, and performing distillation by a Kjeldahl apparatus and titration to measure the total nitrogen content. The measurement method is simple and reliable, simultaneously measures the organic carbon and total nitrogen, can not only achieve a sample measurement effect quickly and conveniently, but also greatly simplify the operation process, and achieves a reliable measurement result.

Description

technical field [0001] The invention relates to the technical field of soil testing services, in particular to a method for measuring organic carbon and total nitrogen in soil. Background technique [0002] Soil is the foundation of plant growth and development. The abundance of nutrient elements (nitrogen, phosphorus, potassium, etc.) in the soil directly affects the growth of crops and the formation of yield and quality. Among them, the role of soil nitrogen is mainly to promote the growth of crop roots, stems, The individual growth of leaves is the primary nutrient element to ensure the quality of agricultural products. In order to pursue high yield, excessive fertilization of the soil has caused soil compaction and pollution problems. Therefore, the detection of organic carbon and nitrogen elements in the soil first, and variable fertilization can effectively prevent the excessive use of chemical fertilizers and soil pollution problems. occur. [0003] In the prior art...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 周纳陈梅霞
Owner FUJIAN HAIXIA ENVIRONMENTAL PROTECTION GRP
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