Table 4.

Analytical results of the amount of Ce, Hg, Pb, Th and U in irreversible hydrocolloid.

Analytical Results
Contract Items	Irreversible Hydrocolloid 1	Irreversible Hydrocolloid 2	Irreversible Hydrocolloid 3	Irreversible Hydrocolloid 4	Irreversible Hydrocolloid 5	Irreversible Hydrocolloid 6	Irreversible Hydrocolloid 7	Irreversible Hydrocolloid 8
Ce	Undefined	6 ppb	Undefined	Undefined	5 ppb	Undefined	Undefined	Undefined
Hg	Undefined	1 ppb	Undefined	1 ppb	1 ppb	Undefined	1 ppb	Undefined
Pb	3 ppb	5 ppb	3 ppb	3 ppb	354 ppb	3 ppb	3 ppb	Undefined
Th	Undefined	1 ppb	Undefined	Undefined	1 ppb	Undefined	Undefined	Undefined
U	Undefined	1 ppb	Undefined	Undefined	1 ppb	Undefined	Undefined	Undefined
Analytical methods used in Determinations
ICP-MS: ICP-MS => 059, 060, 061, 062, 063