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
