832 ANALYTICAL CHEMISTRY, VOL. 60, NO. 8, APRIL 15, 1988 Lajunen, Lauri H. J.; Erjarvi, Erkki; Niemi, Plrjo Finn. Chem. Lett.
Table 11. Detection Limits' of Metal Ionsb metal ion
detection limits, ppb
Cd(I1) Co(I1) Pb(I1) Ni(I1) Cu(I1)
53.0 49.0 46.0 7.7 13.0
1984, 6 . 146. Irth, Hubertus; de Jong, G. J.; Brinkman, U. A. Th.; Frei. R. W, Anal. Ch8m. 1987, 59,98-101. Bond, A. M.; Wallace, G. G. Anal. Chem. 1981, 5 3 , 1209. Bond, A. M.; Wallace, G. G. Anal. Chem. 1982, 5 4 , 1706. Bond, A. M.; Wallace, G. G. Anal. Chem. 1983, 55, 718. Bond, A. M.; Wallace, G. G. J . Ll9. Chromatogr. 1983, 6 , 1799. Bond, A. M.; Wallace, G. G. Anal. Chem. 1984, 56, 2085. Rlordan, K. P.; Heneghan, G.; Wallace, G. G. Anal. Chem. 1985,5 7 ,
1354.
Heneghan, G.; Wallace, G. G. Anal. R o c . (London) 1988, 2 3 , 29. Hojabrl, H.; Lavin, A. C.; Wallace, G. G. Anal. Chem. 1987, 59, 54. Cassidy, R. M.; Eichuck, S.Anal. Chem. 1982, 5 4 , 1558. O'Laughlln, J. W. Anal. Chem. 1982, 5 4 , 178. Wytianbach. A.; Bajo, S.Anal. Chem. 1975, 4 7 , 1813. Fu, Chengguang; Zuo, Bencheng Fenxi Huaxue 1981, 9 , 635. Klng, J. N.; Frltz, J. S.Anal. Chem. 1987, 59, 703.
'Detection limit taken as twice the signal to noise ratio. bSolvent 40/60 MeOH-H,O with 1 X lo4 BHEDTC and 1 X low4 Zn(I1): detector. UV. X = 300 nm: iniection, 50-ULsample.
cobalt at X = 321 nm gives detection levels 4.9 and 3.5 ppb, respectively.
Hailin Ge G. G. Wallace*
Registry No. Cd, 7440-43-9; Co, 7440-48-4; Pb, 7439-92-1; Ni, 7440-02-0; Cu, 7440-50-8; Zn(B&IEDTC),, 19163-92-9.
Chemistry Department University of Wollongong P.O. Box 1144 Wollongong, New South Wales 2500 Australia
LITERATURE CITED (1) Liska, 0.;Gulochon, G.; Colin, H. J . Chromatogr. 1979, 171,
145-151. (2) Liska, 0.; Lehotay, J.; Brandsteterova, E.; Guiochon, G.; Colin, J. J . Chromatogr. 1979, 172, 384-387. (3) Edward-Inatimi, E. B. J . Chromatogr. 1983, 256, 253. (4) Smlth, R. M.; Butt, A. M.; Thakur, A. Ana/y.st (London) 1985, 710, 35.
RECEIVED for review July 7, 1987. Accepted December 14, 1987. This work was supported by the Dionex Corp.
ADDENDUM The revised Table I1 appears below. The data set proper and the conclusions of the paper are unchanged. With the last two GISP values dropped, the mean ad with standard deviation becomes 1.041 474 f 0.000 11. The mean a with standard deviation becomes 1.041463 f 0.000193. After combining all the errors in precision for each process, we would now assign a a value of 1.0414 f 0.0003.
Carbon Dioxide-Water Oxygen Isotope Fractioilation Factor Using Chlorine Trifluoride and Guanidine Hydrochloride Techniques Joseph P. Dugan, Jr., and James Borthwick (Anal. Chem. 1986,58, 3052-3054).
Correspondence subsequent to publication has revealed several mix ups concerning the basis for calculation of the values in Table 11. An extensive review of laboratory records showed the p values to be incorrect. Also, the last two GISP results were found to be poorly documented in laboratory records.
There were also wrong mathematical signs in eq 5 p(6180,
aCOrH~=
(6180,
-
PO,)
- EO,)
and a =
1000 + 6C02 1000 + 6H20
Table 11. Fractionation Factors for C 0 2 - H 2 0 Obtained from Equilibration, Chlorine Trifluoride Analysis, a n d Guanidine Hydrochloride Technique P
6180c02ion'
6180co;
6180H20 ione
a
V-SMOW
4.06 4.06 469.50 469.50 469.50
13.591 13.591 19.308 19.308 19.308
35.78 35.78 41.56 41.56 41.56
-26.372 -26.292 -21.415 -21.521 -21.955
-5.54' -5.50' 0.22d 0.1Id -0.33d
1.041655 1.041 561 1.041330 1.041 444 1.041908
SLAP
3.68 3.68 3.86 3.86 461.40 461.40 461.40
-31.497 -31.497 -30.102 -30.102 -37.910 -37.910 -37.910
-9.90 -9.90 -8.51 -8.51 -16.34 -16.34 -16.34
-66.932 -67.024 -68.472 -68.330 -75.556 -75.877 -75.905
-49.17' -49.27' -48.03d -47.8ad -55.2ad -55.61d -55.64d
1.041 290 1.041 399 1.041 514 1.041 350 1.041 186 1.041 582 1.041 616
GISP
3.65 3.65 3.65
-6.909 -6.909 -6.909
15.01 15.01 15.01
-44.792 -25.41' 1.041 514 -44.752 -25.37' 1.041 472 -44.715 -25.33' 1.041 429 mean of ac and standard deviation 1.041 474 i 0.000 11 mean of ad and standard deviation 1.041491 i 0.000 21 mean of a and standard deviation 1.041463 i 0.000 193
"Measured 6l80 of COz in equilibrium vessel after equilibration (6l80,). *Data normalized to V-SMOW/SLAP using the result from analyses of the standards before equilibration. Data obtained from chlorine trifluoride analysis. Data obtained by using guanidine hydrochloride technique. 'Raw data corrected for machine effects and effects of and 170.
