AOAC Methods in Codex STAN 234 (Preliminary Methods Review)

973

J. ASSOC OH'. ANAL. CHEM. (VOL. 6.5, NO. 4, 1982)

GAJAN ET AL..

Table 2. Resu.lts fr.om a.r:ralySi$ • cot NBS mate:ri.afs

Cadmn:im. ppm

Lead. ppm

Sampleo

Declared

Found

Found

Declared

0.27 ±0.. 04 ·.0.029 ::I: 0.004 0:03.'2 ± 0.007 3.5 ·:l: ·0.4 3r.1

0.34 :!: 0,08

0.40.0.34 0.03

0.32, 0.28 002 0.02 3,4,. 3.0. 3,6·C 2 ..'5 1.1. 1.2. 1.4 0.02, 0.02, 0.06

Bovine liver (SRM 1577) Rice Flour (SRM 1568) Wheat Flour (SRM 1567) Oysters (SRM 1566) Tomato Leaves ($RM 1573) Pine Needles ($RM 1575) Spinach (S RM 1570) Tuna (RM 50)

<0.02 0.53, 0 49, 0.49 C 6.0 10.4 12. 0 97. 0.92 0.31, 0.31, 0.65

048 .:1: 0.0 4 6.3 ± 03 10.8 ·± 0.5 1.2 ::1: 0.2 0.46 11

• Results obtained by DPASV /HM1DE.

0 $RM~ Standard Reference Material; RM~ Research Ma,teroal. < Results obtained by LSASV/CMG'f.. d Uncertified.

shown in Tab[£ 2. Results were obtained by ID1PASV /liM:O:E, l'xcept for one oyster result ob– tained by LS.ASV/CMGE. A l - 2 g sample was a.naO-yz.ed for e.ach of th.cse dry materials. The r.esul,ts are in good agre·ement with NBS values, with the -exception -o.f ,cadmiurn in both the rice and wheat .Hou.rs. Results of re.cove!)' f.tudies made with selected foods, using DPASVJ HMDE, are shown in Table 3. Recoveri,es ave.raged 96.0% for cadmium with a coeffici

logical samples was due to the formation oJ the metastannic acid. Thallium may possibly interfere with the lead determination, but its occurrence in food is very unlikely. Instructions for handling samples containing thallium are given in the complete method (15). Sample Analyses Eight National Bureau of Standards ,(NBS) bi– ological materials were analyzed for cadmium and lead by this method and tlbte results are

Table 3. Reco11,eries of ,cadmium and lead ·f,rom selected foods iby IP.PAS11/HMOE

Cadrn·,um

Lead

No. of detns

Added,

Food

No. of detns

Added.

Rec:.. %•'

Rec.. %a

ppm

ppm

commodity

89 ± 12 65, 100

0.1 0.2 0.3 0.1 0.2

Apple juice 0

11

0.1 0.2

103.95 94,99 107 ± 20 92 :I: 22 94 ± 18

2 2 6 5 7 1

2

Baby cerealc

0.05

112. 126, 100

3 6 4 3 3

89 ± 11 96:: 4

0.1 0.5

92 84

0.25

I

0.5 0.1

87 :;I; 18

Baby beet 0

0.05

72,110. 80 %80, 90

6

0.1

2 3 2 2 5 4 2

Mackere1c1

•0.05 0.2 0.5 0.1 0.2 0.2 0.4 0.1 0.05

11•6, 100

0.05

106,92

2 3 7. 4 5 4

110. 115, 100

115,115.105

0.2 0.5 0.2 0.1 0.2 •0.4 •0.2

101, 112 89 ::I: 16 101 ± 14 80 ± 10

101, 103

Flounder•

·93, 93 75, ,92 92 ± 9 92 :: 3

Infant formula 1

I

l

108

108

Green beanso

3

89, 74,101

84.84,91

3

• For 4 or more determinations, me;in ::I: .SD js r·eport,ed, b Glass-packed. c Infant farina. ° Fresh fillets. • Freeze-dried. 1 Milk base.

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