SU1454339A1 - Method of decomposition of chloroorganic pesticides in soil - Google Patents

Abstract

The invention relates to agriculture, in particular to methods for the decomposition of organochlorine pesticides that accumulate in the soil when applied. The purpose of the invention, the acceleration of the decomposition of organochlorine pesticides, is achieved by introducing -. nor to the soil of detoxicant. As detoxicants, 8, K-diethyl-N-cyclohexylthiocarbamate (ronite) at a dose of 5-1-1 kg / ha or (methoxycarbonylamino) -phenyl-K (tolyl-3) -carbamato (betanal) at a dose of 4-16 kg / ha, then the soil is exposed for 21- 60 days. The application of ronite and betanal in recommended doses increases the rate of detoxification of organochlorine pesticides, their concentration in the soil decreases by a factor of 2 to 19. Herbitsvdy drops and betanal are easily decomposable, after 60 days. after being applied to the soil, they are almost completely degraded. A comparison of the effects of ronite and betanal with a known sodium humate detoxifier showed that they are more effective detoxifiers. 3 tab. (L

Description

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The invention relates to agriculture, namely to methods. decomposition of organochlorine pesticides accumulating in the soil during their use.

The purpose of the invention is to accelerate the decomposition of organochlorine pesticides (OCPs) in the soil.

I Example 1. To the soil, contaminated OCPs (14 kg / ha of 12% HCH dust and 5 kg / ha of a 20% emulsion of a gel), in a known manner, add E-HZ- (methoxycarbonylamino) phenylJ- -N (tolyl-3) carbamate (betanal) of a total of 4 kg / ha. Exposure time: 21 days. As a result, the soil Celtan content was 1.5 mg / kg (in the control 6.0 mg / kg), HCH 7.4 mg / kg (in the ontrol 17.8 mg / kg)

: PRI M e r 2. In a similar way, 8 kg / ha of betanal are introduced. Time rkpozitsyi 45 days.

I As a result, the content of Celtan b in the soil was 1 mg / kg (in control 3.5 mg / kg), HCH 5.35 mg / kg (in Control 16.1 mg / kg)

EXAMPLE 3. In a similar manner, prilepy 1 introduces 10-kg / ha of betanal. The exposure time is 60 days.

As a result, the content of Celtan in the soil was O mg / kg (in the control, 3.0 mg / kg), HCH 0.5 mg / kg (in Control 9.5 mg / kg).

; Example 4. In the soil, contaminated HOP (85 kg / ha of 12% duster HCH and 10 kg / ha of a 20% Celtan emulsion), S, K-diethyl-L-cyclohexylthiocarbamate are made by limestone. (drops) at the rate of 5 kg / hectare. Exposure time 21 days

As a result, the HCH content in the soil was 28.3 mg / kg (in the control 100 mg / kg), Celtane 6.9 mg / kg (in the control 14 mg / kg). .

Example .5. Analogously to Example 4, 7 kg / ha of ronite are introduced. The exposure time is 45 days.

As a result, the HCCH content was 10 mg / kg (in the control 75 mg / kg

A PRI me R 6. Analogously to Example 4, 11 kg / ha of ronite are introduced. The exposure time is 60 days.

As a result, the HCCH content was 1.5 mg / kg (in the control, 59 Mr / K Celtan, 0.5 mg / kg (in the control, 8.5 mg / kg).

Test results presented

in tab. one.

From the data presented in Table I, it can be seen that the application of ronite and batanal in recommended doses contributes to an increase in the rate of OCP detoxification in soil. Concentrations xx, compared with the control, are 2–19 times less; This is due to the stimulation of the activity of microorganisms caused by the addition of ronite and betanal, an additional source of nitrogen compounds in the soil. Smaller herbicide concentrations have virtually no significant effect on the rate of decomposition of OCPs, and higher doses of herbicides due to their accumulation in the soil can be dangerous for subsequent crops.

Herbicides proposed to accelerate the detoxification of organochlorine pesticides are easily degradable, moderate to low toxicity.

In tab. 2 presents data on the content of herbicides in the soil, used to detoxify OCPs.

From daN: The nihs presented in Table 2 show that the content of herbicides in the soil after 45 days. after application, it ranges from 0.01 to 0.07 mg / kg and after 6; 0 days. they are practically absent, i.e. completely decompose

Table 2 presents a comparison. The data on the decomposition of OCPs in soils is obtained when soil was added to sodium and betanal or ronite.

In the soil were made dokhimikaty based on the active ingredient 1 2% dust HCH -, 60 mg / kg, 20% concentrate of the emulsion Keltan - 20 mg / kg soil

From the table. 3 data shows that in the control variants, the OCPs after two days are determined in concentrations equal to 31.2 and 9, 1 mg / kg of soil (52 and 45.5% of the applied quantity). This data does not indicate decomposition, and on the adsorption of pesticides by the soil absorbing complex. In the variants with sodium humate, the adsorption of pesticides is more pronounced, which is reflected in lower levels of their content compared to control. With an increase in the time after the introduction of pesticides to 10 days, the intensity of desorption processes increases, which leads to an increase in their content. And only after 10 days decomposition processes lead to a decrease in soil

dohimikatov. On the 15th day, in the variants with sodium humate, the content of organochlorine pesticides is only 4.1 and 2.8 mg / kg less compared to the control, which indicates a low rate of detoxification of SOD under the influence of sodium humate. At the same time, ronite and betanal interfere with the adsorption of Celtan and HCH. This is expressed in that after 2 days their concentration is slightly different from the doses administered. Being in an unconnected state, HCH and Keltan under the dedication of betanal and ronite undergo decomposition more quickly, and on the 15th day their concentration in the soil is 2-2.6 times less than in the control, and 1.8-2.0 times less than in the variants with sodium humate. The findings suggest

that betanal and ronite are more effective and detoxinating in the decomposition of OCP than sodium humate,

Claims (1)

Invention Formula A method of decomposing organochlorine pesticides in the soil, including soil moistening and the introduction of a detoxicant, characterized in that, in order to accelerate the decomposition of organochlorine pesticides in the soil, S, H-diethyl-N-cyclohexylthiocarbamate is used as a detoxicant. 5-1 1 kg / ha 1-1 (methoxycarboxylamino) fe- (tolyl-3) carbamate, and it is introduced into the soil in a dose of 4-10 kg / ha, then the soil is exposed for 21-60 days. 2 four eight 0 2 five 7 one Betanal 0.2 0.3 0.7 1.1 Ronite 0.25 0.4 0.6 1.0 Not found Not found Traces Traces Not found Traces Traces 0,005 23.5 21.0 5.3 8.1 51.3 47.9 15.1 10.4 55,347,8 14.29,5 38.325.7 7.3 4.6