Lead
Lead
Lead_None_Other_LTK_Eng_Ody.fm Page 3 of 8
Interferences
Interference studies were conducted by preparing a known lead solution of
approximately 25 µg/L as well as the potential interfering ion. The ion was said
to interfere when the resulting lead concentration changed by ±10%. Samples
containing levels exceeding these concentration values may be diluted 1:1 and
re-analyzed. Multiply the value obtained by a factor of 2 to determine the lead
present in the original sample.
Every effort has been made to prevent contamination in packaging the reagents.
Use of black rubber stoppers, black dropper bulbs and droppers with inked
graduations may contaminate the sample and should be avoided. Use the plastic
droppers provided in the reagent set.
Acid-wash all glassware and plasticware to prevent sample contamination,
especially if the previous sample had a high lead level (see Apparatus and Sample
Preparation).
13. Add the contents of
one pPb-5 Indicator
Powder Pillow to the
sample and swirl
thoroughly to mix.
The solution will turn
brown.
14. Touch the timer icon.
Touch
OK.
A second two-minute
reaction period will begin.
15. When the timer
beeps, place the sample
cell into the cell holder.
16. Touch Zero.
The display will show:
0 µg/L Pb
17. Remove the sample
cell and add 6 drops of
pPb-6 Decolorizer
Solution to the cell. Swirl
to mix thoroughly.
18. Place the sample cell
into the cell holder.
19. Touch Read.
Results will appear in
µg/L Pb.
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
Zero
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
Read
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