Id

Sample description

AVG (n = 2)

[mg kg⁻¹ Cu]

RSD

[%]

Remarks

A

B

C

D

E

F

G

PE reference, batch (1)

PE pigment starting material

Cake Intermediate pigment, treated with MTBE

Cake Intermediate pigment, treated with MTBE, H₂O and H₂SO₄

Base material LDPE 1965

PE reference, batch (2)

ERM-EC680m Low-density olyethylene

Limit of Detection Cu

4.6

47

3.9

13

0.05

16

12.5

0.1

14

18

13

9

(“125”)

100

10

High deviation; processing background

High deviation

High deviation

Low deviation

Background Concentration/raw

Very high deviation also compared with A

Processing background

Used as internal control sample (Cu not certified)