Chemical and Biological Technologies in Agriculture

Table 4 Result of total element analysis and leaching test of three heavy metals

From: Effects of paraffin external coating on the degradable flower pot made of sludge cake

		Flower pot	Thai Std	Canadian Std
TEA (mg kg⁻¹)	Lead (Pb)	9.55	400^a	375^b
	Nickel (Ni)	1.29	1600^a	150^b
	Copper (Cu)	10.38	–^a	150^b
LT (μg L⁻¹)	Lead (Pb)	0.88	5000^c
	Nickel (Ni)	0.12	20,000^c
	Copper (Cu)	0.57	25,000^c

Figures show the average (n = 3)
TEA total element analysis, LT leaching test, Std standard value specified
^a Soil Quality Standard, Thailand [22]
^b Criteria for managing contaminated sites in British Columbia, Canada [25]
^c Notification of the Ministry of Industry, Thailand [26]

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