Thailand Thailand updates the environmental standard for soil

For the first time in 17 yrs

The National Environmental Board of Thailand announced “Notification of the National Environmental Board: Soil Quality Standard” in the Royal Gazette on 11 March 2021. The notification issued under the Enhancement and Conservation of National Environmental Quality Act B.E.2535 (1992) repeals and replaces “Notification of the National Environmental Board, No. 25, B.E. 2547 (2004) Soil quality standard”.

The standard categorizes soil into two groups based on land use namely, (1) residential use and (2) other use such as agriculture or industry. Several new parameters, copper, chlorpyrifos, glyphosate, paraquat dichloride, and 2,3,7,8-TCDD, were added. Moreover, PCBs in the old standard were replaced by PCB-126. Standard value was also updated based on a risk-based approach.

 

Soil Standard for Other Use

Parameter Old standard New standard
1. Volatile Organic Compound Unit (mg/kg) Unit (mg/kg)
1 Benzene 15 5
2 Carbon Tetrachloride 5.3 30
3 1,2-Dichloroethane 7.6 21
4 1,1-Dichloroethylene 1.2 993
5 cis-1,2-Dichloroethylene 150 1750
6 trans-1,2-Dichloroethylene 210 17500
7 Dichloromethane 210 2750
8 Ethylbenzene 230 19350
9 Styrene 1700 33190
10 Tetrachloroethylene 190 382
11 Toluene 520 40140
12 Trichloroethylene 61 6
13 1,1,1-Trichloroethane 1400 35400
14 1,1,2-Trichloroethane 19 6
15 Total Xylenes 210 2478
2. Heavy Metals Unit (mg/kg) Unit (mg/kg)
1 Arsenic 27 25
2 Cadmium and compounds 810 762
3 Hexavalent Chromium 640 212
4 Lead 750 800
5 Manganese and compounds 32000 19640
6 Mercury and compounds 610 263
7 Nickel 41000 5205
8 Selenium 10000 4380
9 Copper 35040
10 Zinc
3. Pesticides Unit (mg/kg) Unit (mg/kg)
1 Atrazine 110 22955
2 Chlordane 110 64
3 Chlorpyrifos 819
4 2,4-D 12000 7500
5 DDT 120 70
6 Dieldrin 1.5 1
7 Glyphosate 65590
8 Heptachlor 5.5 5
9 Heptachlor Epoxide 2.7 3
10 Lindane 29 21
11 Paraquat Dichloride 2950
12 Pentachlorophenol 110 36
4. Others Unit (mg/kg) Unit (mg/kg)
1 Benzo (a) pyrene 2.9 1.8
2 Cyanide and compounds 35 138
3 PCBs 10
4 Vinyl Chloride 8.3 1.6
5 2,3,7,8-TCDD 0.00002 (20 ng/kg)
6 PCB-126 0.001 (1 μg/kg)

 

The notification came into force on 12 March 2020.

Download original text of the Notification at
http://www.ratchakitcha.soc.go.th/DATA/PDF/2564/E/054/T_0020.PDF