Page:NIOSH Manual of Analytical Methods - 7304.pdf/10

 ELEMENTS by ICP (Microwave Digestion): METHOD 7304, Issue 1, dated 25 June 2014 - Page 10 of 11

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

Bias

Range of Bias

Precision Accuracy (%) SrT

Lowest Level(2)

0.0240

0.0419

9.9

50.25

0.1505

0.0379

15.1

15

Element

Instrument

From

To

From

To

Aluminum

Fisons

5.025

1500

-0.0318

-0.1022

Aluminum

P-E Optima

5.025

1500

0.0833

0.0567

Antimony

Fisons

5.025

1500

Poor and variable recoveries across study range.

(1)

Arsenic

Fisons

5.025

1500

0.0630

-0.0671

0.1584

0.0461

14.3

15

Barium

Fisons

0.5038

150.4

0.0433

0.0222

0.0716

0.0182

7.6

0.5

Beryllium

Fisons

0.0509

15.2

0.0652

0.0366

0.0980

0.0163

9.5

0.0509

Boron

Fisons

2.514

750.4

-0.0387

-0.1362

0.0118

0.0164

6.4

7.504

Cadmium

Fisons

1.005

300.0

0.0923

0.0718

0.1167

0.0307

14.8

1.005

Calcium

Fisons

15.08

4500

0.0779

-0.0536

0.1624

0.0313

13.4

150.75

Calcium

P-E Optima

15.08

4500

0.0453

0.0098

0.0963

0.0245

8.8

15.08

Chromium

Fisons

2.514

750.4

0.1395

0.0974

0.1865

0.0214

18

2.514

Chromium

P-E Optima

2.514

750.4

-0.0018

-0.0701

0.1245

0.0131

<5

2.514

Cobalt

Fisons

2.514

750.4

0.0592

-0.1013

0.1508

0.0264

10.4

7.504

Copper

Fisons

0.5038

150.4

0.0475

0.0272

0.0684

0.0240

8.9

0.5038

Copper

P-E Optima

0.5038

150.4

0.0829

0.0313

0.1716

0.0217

12.1

1.504

Iron

Fisons

10.05

3000

0.1101

0.0630

0.2057

0.0397

18.6

30

Iron

Fisons

10.05

3000

0.0836

0.0630

0.0974

0.0396

15.4

100.5

Iron

P-E Optima

10.05

3000

0.0445

-0.0205

0.1255

0.0404

11.4

30

Lead

Fisons

5.025

1500

-0.0241

-0.0668

0.0124

0.0279

6.9

5.025

Lithium

Fisons

0.5038

150.4

-0.0690

-0.1804

0.0132

0.0276

11.1

0.5038

Magnesium

Fisons

5.025

1500

0.0156

-0.0253

0.0524

0.0171

<5

5.025

Magnesium

P-E Optima

5.025

1500

0.0715

0.0421

0.1372

0.0249

11.5

5.025

Manganese

Fisons

0.5038

150.4

0.1357

0.1005

0.1755

0.0201

17.3

0.5038

Fisons

1.509

450.4

-0.0388

-0.1597

0.1353

0.0795

16.7

1.509

P-E Optima

1.509

450.4

-0.0489

-0.2033

0.0969

0.0179

7.7

1.509

Nickel

Fisons

1.509

450.4

0.0787

0.0293

0.1274

0.0338

13.8

4.504

Nickel

P-E Optima

1.509

450.4

0.0645

0.0177

0.1406

0.0159

9.2

1.509

Phosphorus

Fisons

10.05

3000

-0.0546

-0.1818

0.0011

0.0417

12

30

Phosphorus

P-E Optima

10.05

3000

-0.0163

-0.1364

0.0333

0.0124

<5

10.05

Platinum

Fisons

50

15000

0.0423

0.0097

0.0671

0.0226

8.2

150

Potassium

Fisons

10.05

3000

-0.0909

-0.1443

-0.0316

0.0265

13.1

100.5

Potassium

P-E Optima

10.05

3000

-0.0499

-0.0998

-0.0060

0.0249

8.8

100.5

Selenium

Fisons

25.12

7500

0.0941

0.0675

0.1150

0.0150

12.1

25.12

Selenium

P-E Optima

25.12

7500

0.0026

-0.0027

0.0115

0.0127

<5

25.12

Silver

Fisons

1.005

300

Poor and variable recoveries across study range.

Sodium

Fisons

25.12

7500

-0.0492

-0.1694

0.0718

0.0246

8.8

251.2

Strontium

Fisons

2.514

750.4

0.0172

-0.00002

0.0373

0.0153

<5

2.514

Tellurium

Fisons

10.05

3000

0.0295

-0.0420

0.1037

0.0404

9.8

30

(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