Test Results

Immobilization treatment using actual contaminated soil

Here are some results from immobilization treatment tests conducted using DENITE on a variety of contaminated soils.

Soil	Target element		DENITE added * (kg/m³)	Amount leached(mg/ℓ) **		Soil leaching standard (mg/ℓ)	pH (test solution)
Soil	Target element		DENITE added * (kg/m³)	Pre-treatment	Post-treatment	Soil leaching standard (mg/ℓ)	pH (test solution)
Soil (1)	Fluorine	F	100	2.4	0.36	0.8 or less	9.9
Soil (2)	Fluorine	F	300	15.0	0.08	0.8 or less	10.6
Soil (3)	Arsenic	As	150	0.2	<0.002	0.01 or less	10.3
Soil (4)	Boron	B	100	12.3	0.71	1 or less	10.2
Soil (5)	Hexavalent chromium	Cr(VI)	200	0.21	<0.02	0.05 or less	10.2
Soil (6)	Mercury	Hg	100	0.0018	<0.00005	0.0005 or less	9.9
Soil (7)	Lead	Pb	100	1.6 ***	<0.01	0.01 or less	10.6
Soil (8)	Arsenic	As	100	7.29 ***	0.01	0.01 or less	10.3

* The amount of DENITE added will differ according to a variety of factors, including the state of contamination (types of contaminants and their concentrations) and the methods used.
** The leaching test method conforms to Ministry of Environment Notification No. 18 (March 6, 2003).
*** Soil contaminated at concentrations exceeding the secondary leaching standard (0.3mg/ℓ or less) designated by the Soil Contamination Countermeasures Act.

Immobilization effect under acidic/alkaline conditions

To assess the immobilization stability of DENITE-treated soil against external factors, such as acid and alkaline conditions, we conducted tests using a relative assessment method* for the stability of the pH change for soil treated to immobilize heavy metals at the Geo-Environmental Protection Center.

We were able to determine that DENITE demonstrated a stable immobilization effect even under acid and alkaline conditions, with no marked difference in leaching amount seen by test method.

Soil	Target element		DENITE added (kg/m³)	Amount leached (mg/ℓ)				Leaching amount standard (mg/ℓ)
				Pre- treatment	After DENITE treatment
				Ministry of Environment Notification No. 18 **	Ministry of Environment Notification No. 18 **	Leaching test for heavy metals-immobilized soil using acid solution *	Leaching test for heavy metals-immobilized soil using alkaline solution *
SoilA	Lead	Pb	100	0.10	<0.01	<0.01	<0.01	0.01 or less
SoilB	Arsenic	As	100	0.11	0.008	0.008	0.007	0.01 or less
SoilC	Fluorine	F	100	2.64	0.2	0.2	0.2	0.8 or less

* Conforms to the Geo-Environmental Protection Center, CEPC Technical Standards, and GEPC TS-02-S1.
** The leaching test method conforms to Ministry of Environment Notification No. 18 (March 6, 2003).