Cyanamide

Other distribution data

Administrative data

Endpoint:

other distribution data

Remarks:

leaching study

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1991

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1991

Report date:

1990

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: BBA Guideline for the Testing of Plant Protection Products (Part IV-4-2: Versickerungsverhalten von Pflanzenschutzmitteln) adopted December 1986

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

soil leaching

Media:

water - soil

Test material

Test material information

Constituent 1

Reference substance name:

Cyanamide

EC Number:

206-992-3

EC Name:

Cyanamide

Cas Number:

420-04-2

Molecular formula:

CH2N2

IUPAC Name:

cyanamide

Test material form:

other: aqueous solution

Details on test material:

- Test material: ALZODEF (an 49 % (w/w) aqueous solution of cyanamide)
- Charge number: 89018603
- Appearance: Aqueous solution

Results and discussion

Any other information on results incl. tables

Amount of Leachate:

The amount of leachate collected after two days ranged from 388 to 410 mL.

Concentration in leachate:

The amount of cyanamide in the leachate was in the range of 0.007 – 0.28 µg/mL representing 0.08 to 2.8 % of the applied amount of hydrogen cyanamide. The cyanamide concentration in the leachate was highest in the Standard 2.1 soil. This soil had a very low organic carbon, silt and clay content resulting in a reduced adsorption capacity.

Results of column leaching study with ALZODEF:

		Standard 2.1 (sand)	Standard 2.2 (slightly loamy sand)	Standard 2.3 (moderate silty sand)
mL leachate	Rep a	403	400	410
	Rep b	395	396	389
	average	399	398	400
mg cyanamide in leachate/column	Rep a	0.113	0.024	0.003
	Rep b	0.107	0.051	0.007
	average	0.110	0.038	0.005
% of applied cyanamide in leachate	Rep a	2.9	0.6	0.08
	Rep b	2.7	1.3	0.18
	average	2.8	1.0	0.13
µg cyanamide/ mL leachate	Rep a	0.28	0.059	0.007
	Rep b	0.27	0.128	0.017
	average	0.28	0.094	0.012

Applicant's summary and conclusion

Conclusions:

Cyanamide was slightly mobile in columns of all three soil types studied. The mobility decreased with increasing fineness of soil texture and also with increasing soil organic carbon content.

Executive summary:

The mobility of cyanamide, the active ingredient of ALZODEF, was investigated in three different soils (sand, slightly loamy sand and moderate silty sand) using the column leaching method. For this purpose the soils were packed into glass columns saturated with water. ALZODEF was added on the top of the soil column at a nominal concentration of 8 mg ALZODEF per column equivalent to 3.92 mg cyanamide/column and corresponding to a field application rate of 40 l ALZODEF/ha. The columns were incubated at 20 ± 2°C in the dark and a total amount of 393 mL (200 mm) distilled water was applied dropwise to each soil column over a period of 2 days. The leachate was collected.

 

The amount of cyanamide in the leachate was in the range of 0.007 – 0.28 µg/mL representing 0.08 to 2.8 % of the applied amount of hydrogen cyanamide. The cyanamide concentration in the leachate was highest in the Standard 2.1 soil. This soil had a very low organic carbon, silt and clay content resulting in a reduced adsorption capacity.

Cyanamide was slightly mobile in columns of all three soil types studied. The mobility decreased with increasing fineness of soil texture and also with increasing soil organic carbon content.