AOAC Final Action Methods in 2017

554 P ACQUETTE & T HOMPSON : J OURNAL OF AOAC I NTERNATIONAL V OL . 101, N O . 2, 2018

Table 5. NIST SRM 1849a results for participating laboratories and instrument type Lab, instrument Days Na, mg/kg Mg, mg/kg P, mg/kg K, mg/kg Ca, mg/kg Mn, mg/kg Fe, mg/kg Cu, mg/kg Zn, mg/kg Cr, mg/kg Se, mg/kg Mo, mg/kg SLV (4), Agilent 7700x n = 16 4324 1640 4065 9458 5351 48.70 173.5 19.70 150.8 1.050 0.827 1.660 Lab 4, Agilent 7800 Day 1 4146 1607 3945 9152 5222 47.18 174.2 18.79 149.0 1.680 a 0.814 1.572 Day 2 4253 1611 4100 9365 5264 47.85 171.1 18.67 149.0 0.974 a 0.793 1.590 Lab 5, Agilent 7700x Day 1 4385 1645 4143 9429 5061 49.52 178.6 20.20 153.4 1.049 0.842 1.585 Day 2 4345 1640 4098 9525 5242 48.91 173.8 19.94 154.2 1.062 0.824 1.608 Lab 6, Thermo iCap QC Day 1 4338 1621 3975 9649 5464 49.76 173.4 19.69 150.9 1.062 0.827 1.681 Day 2 4321 1628 3889 9524 5488 49.88 173.3 19.76 143.8 1.058 0.826 1.685 Lab 9, Agilent 7700x Day 1 4242 1641 4065 9250 5437 49.80 174.0 19.57 149.5 1.095 0.835 1.612 Day 2 4276 1619 3917 9395 5448 49.04 172.7 19.59 150.1 1.084 0.838 1.610 Lab 12, Thermo iCap QC Day 1 4262 1599 3989 9274 5229 48.85 172.1 19.80 152.0 1.030 0.801 1.629 Day 2 4227 1629 3989 9254 5319 48.46 170.8 19.70 152.3 1.047 0.736 1.614 Lab 13, Agilent 7500ce Day 1 4246 1666 4033 9299 5274 49.58 172.7 19.86 155.3 1.060 0.814 1.648 Day 2 4256 1674 3971 9270 5214 49.30 174.0 20.20 153.0 1.044 0.809 1.644 Lab 14, PE Nexion 300D Day 1 4243 1629 3966 9417 5245 47.70 169.7 19.20 150.3 Day 2 4249 1604 4005 9288 5267 47.11 169.7 18.83 152.6 Lab 15, Agilent 7700x Day 1 4200 1610 4110 9370 5160 49.20 174.0 20.50 160.0 1.050 0.824 1.676 Day 2 4390 1670 4100 9600 5280 49.10 174.0 19.90 157.0 1.052 0.842 1.639 Lab 16, Agilent 7800 Day 1 4218 1608 3952 9326 5356 48.24 172.2 19.48 150.0 Day 2 4180 1593 3959 9380 5256 48.22 172.4 19.29 148.4 Lab 17, PE Nexion Lab 300D Day 1 4199 1588 3909 9215 5088 48.44 169.7 19.36 151.4 1.046 0.780 1.693 Day 2 4155 1600 4084 9125 5114 48.02 170.2 19.38 155.1 1.093 0.930 1.637 Overall Mean 4263 1626 4015 9365 b 5279 48.71 172.7 19.60 151.8 1.058 0.822 1.636 b RSD, % 1.4 1.3 1.5 1.3 2.1 1.6 1.1 2.3 2.0 1.5 3.0 2.1 Certified 4182 – 4348 1612 – 1684 3850 – 4130 9110 – 9330 5202 – 5304 47.8 – 50.6 172.7 – 178.5 19.52 – 20.04 145.4 – 156.6 1.04 – 1.10 0.783 – 0.841 1.667 – 1.747 a Outlier results that are not used in the calculation of the mean or RSD. b These mean values are outside of the NIST Certified Range.

Downloaded from https://academic.oup.com/jaoac/article-abstract/101/2/536/5653941 by guest on 05 May 2020