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Heritage Science

Table 4 Measures of closeness of agreement, LODs and LOQs obtained with the proposed method

From: Unveiling Harriet Backer: ICP–OES study for the characterisation of the colour tubes from her original paint box

Element

Spectral line (nm)

View mode

Closeness of agreement (%)

LOD (μg/L)

LOQ (μg/L)

Al

396.152

Axial

4.6

0.4

1.4

Ba

455.403

Axial

4.5

0.03

0.10

Cd

228.802

Axial

2.6

0.1

0.5

Co

228.616

Axial

2.9

0.2

0.8

Cr

283.563

Axial

4.0

0.2

0.8

Cu

324.754

Axial

4.0

0.3

1.0

Fe

259.940

Axial

1.1

0.2

0.7

K

766.490

Axial

1.6

0.4

1.4

Mg

279.553

Radial

2.7

0.09

0.31

Mn

257.610

Axial

3.2

0.07

0.23

Na

589.592

Radial

4.4

13

45

P

177.495

Axial

0.2

0.7

2.2

Pb

220.353

Axial

2.9

1.1

3.6

S

182.034

Axial

2.6

1.8

6.0

Si

251.611

Axial

1.8

0.8

2.8

Sr

407.771

Axial

3.3

0.03

0.11

Zn

213.856

Axial

6.0

0.2

0.6

  1. The closeness of agreement was computed as the mean percentage deviation from the expected value for the mean of 11 independently prepared reference solutions. For the LOD and LOQ, nblanks = 10. For the calculations of the closeness of agreement, LOD and LOQ, deviant values were discarded according to the ISO-recommended Grubbs’ test with P = 0.05 [44]
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