CN102297799A

CN102297799A - Method for leaching nitrate nitrogen in soil

Info

Publication number: CN102297799A
Application number: CN2011102009007A
Authority: CN
Inventors: 张玉霞; 张少庆; 王国平
Original assignee: Northeast Institute of Geography and Agroecology of CAS
Current assignee: Northeast Institute of Geography and Agroecology of CAS
Priority date: 2011-07-19
Filing date: 2011-07-19
Publication date: 2011-12-28

Abstract

The invention provides a method for leaching nitrate nitrogen in soil, which is suitable for leaching the nitrate nitrogen in a soil sample. A potassium chloride solution is replaced by distilled water to obtain the content of the nitrate nitrogen in the soil. On the basis of ensuring data accuracy, the experiment cost is saved; the damage of the potassium chloride solution to instruments is effectively avoided. A salt effect is effectively avoided, and a leaching effect is better. Proved by an experiment, the leaching efficiency is improved by 11.1-34.2 percent. The harmful effect of potassium chloride to the environment is avoided. The method for leaching the nitrate nitrogen in the soil is beneficial to thoroughly reduce and eliminate pollution so as to meet the requirements of green chemistry.

Description

Nitrate nitrogen leach extraction method in a kind of soil

Technical field

The present invention relates to nitrate nitrogen leach extraction method in a kind of soil.

Background technology

Nitre nitrogen belongs to soil nutrient, reflects the intensity of variation of nutrient in different time in the soil.Now, with nitrate nitrogen in the Klorvess Liquid lixiviate soil, measure nitrate nitrogen with the Continuous Flow Analysis instrument.The method principle is the nitrate radical in the extract, is matrix with the ammonium chloride solution, becomes nitrite anions by red copper facing Cadmium column reduction, and it becomes red azo color base with the diazotising mixture with coupling reagent, and red color intensity is directly proportional with nitrate nitrogen content.At first since salt effect (salt effect) cause the potassium chloride leaching liquor can not be fully with the intact full lixiviate of nitrate nitrogen in the soil come out (" crop water salt associating stress effect and moisture efficiently utilize research ", work such as history beach, Beijing Chinese Water Conservancy water power publishing house 2009.1).Because leaching liquor potassium chloride is the salt solusion of high concentration, after sample test was intact, as the big water gaging flushing of untimely usefulness, then potassium chloride was easy to separate out blocking pipeline in the leaching liquor, even flushing still can have potassium chloride to separate out at instrument pipeline interface in addition.And pipeline leakage or spill accidentally when adding sample, saline solution can corrode instrument.Potassium chloride has harmful effect to environment; The use of potassium causes cost to increase.(" soil agrochemistry analytical approach ", Soil Science Society of China are compiled, Science Press, 1983.3)

Summary of the invention

For solving the problem in the nitrate nitrogen leach extraction method in the existing soil, the invention provides nitrate nitrogen leach extraction method in a kind of soil, its step is as follows:

(1) claims sample: take by weighing the 5.00g sample and put into the 50mL plastic bottle;

(2) lixiviate: add 25mL distilled water, place that 200 rotational oscillations swing 30min on the oscillator, vibrate then to use filter paper filtering, filtrate to be collected in the 25mL color comparison tube;

(3) measure: the filtrate in the color comparison tube is measured with SAN++SKALAR type Continuous Flow Analysis instrument, obtains nitrate nitrogen content in the soil.

Beneficial effect: nitrate nitrogen leach extraction method in a kind of soil provided by the invention, be applicable to the lixiviate of nitrate nitrogen in the pedotheque, replace Klorvess Liquid with distilled water, obtain nitrate nitrogen content in the soil.At first, solved the problem that salt effect (salt effect) that prior art produces with nitrate nitrogen in the Klorvess Liquid lixiviate soil causes the potassium chloride leaching liquor fully the intact full lixiviate of nitrate nitrogen in the soil not to be come out, extracting effect is better, and extracting efficiency has improved 11.1%～34.2%.In addition, the potassium chloride leaching liquor that has solved high concentration is separated out the problem that blocking pipeline and saline solution can corrode instrument easily.The 3rd, avoided potassium chloride that environment is had harmful effect, help reducing and pollution abatement from the source, be a kind of method of Green Chemistry, more meet environmental protection.The 4th, replace potassium chloride with distilled water, save cost.

Embodiment

The nitrate nitrogen lixiviate is improved one's methods in embodiment 1 a kind of soil provided by the invention, and practical operation is used in experiment.

The nitrate nitrogen lixiviate is improved one's methods in a kind of soil provided by the invention, and step is as follows:

(1) claims sample: take by weighing 8 in 5.00g sample respectively, put into the 50mL plastic bottle respectively;

(2) lixiviate: add 25mL distilled water respectively, place that 200 rotational oscillations swing 30min on the oscillator, take off after having vibrated and use filter paper filtering, filtrate is collected in respectively in the 25mL color comparison tube;

(3) measure: the filtrate in each color comparison tube is measured with SAN++SKALAR type Continuous Flow Analysis instrument.

(4) measurement result sees Table 1.

Table 1

Comparative example's 1 existing assay method with nitrate nitrogen in the Klorvess Liquid lixiviate soil, step is as follows:

(1) claims sample: take by weighing 8 in the 5.00g sample corresponding respectively, put into the 50mL plastic bottle respectively with embodiment 1 difference;

(2) lixiviate: add the Klorvess Liquid of the mol/L of 25mL respectively, place that 200 rotational oscillations swing 30min on the oscillator, take off after having vibrated and use filter paper filtering, filtrate is collected in respectively in the 25mL color comparison tube;

(3) measure:: the filtrate in each color comparison tube is measured with SAN++SKALAR type Continuous Flow Analysis instrument.

(4) measurement result sees Table 2.

Table 2

The measurement result contrast of table 1 and table 2

By the measurement result contrast of table 1 and table 2, as can be seen, nitrate nitrogen leach extraction method in a kind of soil provided by the invention is applicable to the lixiviate of nitrate nitrogen in the pedotheque, replaces Klorvess Liquid with distilled water, obtains nitrate nitrogen content in the soil better.Solved salt effect (salt effect) that prior art produces with nitrate nitrogen in the Klorvess Liquid lixiviate soil and caused in the soil nitrate nitrogen extraction rate to put forward low problem, extracting effect is better, and extracting efficiency has improved 11.1%～34.2%.

Claims

1. nitrate nitrogen leach extraction method in the soil, its step is as follows: (1) claims sample: take by weighing the 5.00g sample and put into the 50mL plastic bottle; (2) lixiviate: add 25mL distilled water, place that 200 rotational oscillations swing 30min on the oscillator, vibrate then to use filter paper filtering, filtrate to be collected in the 25mL color comparison tube; (3) measure: the filtrate in the color comparison tube is measured with SAN++SKALAR type Continuous Flow Analysis instrument, obtains nitrate nitrogen content in the soil.