AOAC Methods in Codex STAN 234 (Preliminary Methods Review)

97:-i

GAJAN ET AL.:

J. ASSOC OFF. ANAL. CHEM. (VOL 65, NO. 4, 1982)

Results from analysis of NFPA/CCIAC • r.amples

Table 6.

Lead. ppm

Analyst

CCIACct

Sample tomato juice. CCIAC No. 83 2 3 4 5 Gree.n beans, CCIAC No. 81

0.025 :I: 0,015 0.26 ± 0.04 0.17 z 0.04 0.28 :I: 0.05 0.03 ± 0013 0.227 :I: 0.033 0.097 ± 0.016 0.227 ± 0.034

<0.01 0.26 0.17 0.28

2 3 4 5

0.02 0.20 0.09 0.20

0.01 0.15 0.105 0.20

0.02 0.21 0.10 020

1 National Food Processors Association/Committee of Canning Industries Analytical Chemists b Dry ash/K2S04 method used with DPASV /HMDE. < Ory ash/K2SO~ method used with LSASV/CMGE. d CCIAC results obtained by a variety of methods: mean :I: SD of 24 results.

Two of the lead results were determined to be outliers by the Dixon outlier test (29) and were excluded from the statistical calculations. The CV was about 10% for each element. Two sets of glass-packed fo<)d samples. green beans and tomato juice, which were previously used by the Committee of Canning Industries Analytical Chemists (CCIAC} of the National Food Processors Association in a series of round-robin studies, were also analyzed for lead by 3 analysts using this method. Table 6 com·

ungpiked result was used to calculate lead re– coveries for this food commodity. The mackerel results for lead, however, suggested a lack of homogeneity within the sample, as evidenced by the variability of the spiked results. We have included these results for information only. These laboratories were also sent a sample of well characterized dry baby cereal for analysis. Their results, along with those of both of the authors' laboratories, are shown in Table 5, which also includes a summary 0f the results.

Table 7.

Comparison of cadmium results by DPASV/HMDE and LSASV/CMGE

Cadmium, ppm

OPASV

LSASV

CV.¾

Food commodity a

Added

CV.%

Mean"

SD

Mean I>

SD

Green beans

0.00 0.08 0.28 0.00 0.05 0.23 0.00 0.04 0.21 0.00 0.05 0.12 0.00 0.05 0.20 0.00 0,03 0.15

<0.005 0.076

0.009 0.084 0.265

0.003 0.010 0.014 0.005 0.014 0,007 0,02 0 005 0,001 0.010 0.004 0.006 0023 0.004 0.014

33 12

0.011 0.019 0.002 0010 0.005 0.014

14

0.251

7

5

Apple juice

<0.005

<0.005 0.040 <0.005 0.043

7

0.031 0.17

13

0.181 "

6

8

Infant formula

<0.005 0.036 0.176 <0.005 0.052 0 126

14

16 11 45 15

8

0.181 0.011 0.047 0.130 0.012 0.081 0.238

Fish (mackerel)

0.006 0.012 0.003 0.010 0.0145

12

9

8

Cereal

0.0145 0.084 0.229

19 11

30

6

6

10

Baby beet

<0.005 0.031 0.148

<0.005

0.003 0.008

0.036<

10

12

5

0.153

9

• 10 samples analyzed at each added level unless otherwise indicated. 0 Mean values rounded to 2 decimal places. '9 samples analyzed.

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