Page:NIOSH Manual of Analytical Methods - 7304.pdf/11

 ELEMENTS by ICP (Microwave Digestion): METHOD 7304, Issue 1, dated 25 June 2014 - Page 11 of 11

Table 4. OVERALL PRECISION AND ACCURACY DATA [13] Range Studied (µg/sample)

Precision Accuracy (%) SrT

Lowest Level(2)

0.0163

0.0155

<5

10.05

0.0334

0.0407

8.2

15

Instrument

From

To

From

To

Tellurium

P-E Optima

10.05

3000

-0.0043

-0.0282

Thallium

Fisons

5.025

1500

-0.0081

-0.0362

Thallium

P-E Optima

5.025

1500

Fisons P-E Optima

25.12

7500

-0.0505 -0.0688 -0.0048 0.0250 9 Poor and variable recoveries across study range.

25.12

7500

Poor and variable recoveries across study range.

Tin Tin Titanium

Bias

Range of Bias

Element

(1)

5.025

Fisons

1.005

300

-0.0827

-0.1834

0.0342

0.0269

12.3

3

Titanium

P-E Optima

1.005

300

-0.1072

-0.1732

-0.0387

0.0321

15.3

1.005

Vanadium

Fisons

0.5038

150.4

0.0704

0.0438

0.1114

0.0195

10.5

0.5038

Vanadium

P-E Optima

0.5038

150.4

-0.0063

-0.0217

0.0099

0.0198

<5

0.5038

Yttrium

Fisons

0.2519

75.2

0.0598

0.0466

0.0795

0.0164

8.9

0.2519

Zinc

Fisons

1.005

300

0.1452

0.0630

0.2976

0.0340

22

1.005

Zinc

Fisons

1.005

300

0.1190

0.0630

0.1683

0.0356

18.7

3

Zinc

P-E Optima

1.005

300

-0.0502

-0.0655

-0.0388

0.0295

9.6

3

Zirconium

Fisons

0.5025

150

0.0164

-0.0096

0.0350

0.0175

<5

0.5025

(1) Values reported were obtained with a Fisons ARL Accuris ICP-AES or a Perkin Elmer Optima 3000 DV ICP-AES. (2) Lowest level in range studied at which recoveries were between 81 and 121% recovery and relative standard deviation (Sr) less than 0.1100 on 5 or 6 replicates. Performance may vary with instrument and should be independently verified.

NIOSH Manual of Analytical Methods (NMAM), Fifth Edition