LaMotte LIME REQUIREMENT OF SLUDGE APPLIED SOILS LS User Manual

LEAD IN AIR TEST KIT

L

Mott

WARNING! This set contains chemicals

that may be harmful if misused. Read

cautions on individual containers

carefully. Not to be used by children

except under adult supervision

CODE 7440

QUANTITY CONTENTS CODE

2 x 120 mL *Lead in Air Absorbing Solution *7668-J
120 mL *Lead Dithizone Reagent *4427-J
30 mL *Lead Reagent #2 *7665-G
30 mL *Sodium Hydroxide, 5N *6533-G
30 mL *Hydrochloric Acid, 1N *6130-G
1 pH Indicator Sticks, 7.5 - 14.0 3-2957
1 Pipet, 1.6 mL, glass, w/bulb 0305
2 Test Tubes, 10 mL, glass, w/caps 0843
1 Lead In Air Comparator 4418

*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these
reagents go to www.lamotte.com. To obtain a printed copy, contact LaMotte by
e-mail, phone or fax.

To order individual reagents or test kit components, use the specified code
number.

NOTE: Student use of the chemicals in this kit should be closely
supervised by a responsible adult. *Lead Reagent #2 (7665) contains toxic
sodium cyanide and should never be mixed with any acid - a reaction
which can liberate poisonous hydrogen cyanide gas! *Lead Dithizone
Reagent (4427) contains chloroform. Vapor can cause nausea and
unconsciousness if purposely inhaled. Skin contact with either reagent
should be followed immediately by a thorough washing with soap and
water. Waste water samples from the lead test should be collected in a
labeled glass or plastic bottle and held for disposal by an approved
hazardous waste disposal company.

PRO CE DURE

1. Fill a clean impinging tube to 10 mL line with *Lead In Air

Absorbing Solution (7668). Connect impinging apparatus to intake
of air sampling pump.

NOTE: Make sure the long tube is immersed in the absorbing
solution.

2. Adjust flowmeter to collect air sample at 1.0 Lpm for 10 minutes, or
until a measurable amount of lead is absorbed.

3. Immerse end of pH Strip (3-2957) into solution. Compare the color
of the strip to the color chart. If pH is not between 9 and 11 adjust by
adding drops of *Sodium Hydroxide, 5N (6533) to raise the pH or
drops of *Hydrochloric Acid, 1N (6130) to lower pH. Make sure the
pH is adjusted to between 9 and 11.

4. With special glass pipet (0305), squeeze rubber bulb and insert pipet
below clear preservative layer in *Lead Dithizone Reagent (4227).
Release bulb and draw green solution into pipet until solution level is
even with line. Transfer to clean test tube (0843).

CAUTION: *Lead Dithizone Reagent contains chloroform as a
solvent — avoid spills and breathing vapor. Use with adequate
ventilation.

5. Carefully add 5 drops of *Lead Reagent #2 (7665).
CAUTION: *Lead Reagent #2 is an alkaline solution of cyanide and

should be handled with extreme care. Do not dispose of cyanide
solutions in presence of acids because the highly toxic HCN gas is
evolved.

6. Cap and shake vigorously for 10-15 seconds. Remove cap and allow
test tube to stand undisturbed for 1 minute. After 1 minute the layers
will separate, producing a yellow to orange layer on top. No pink or
red should be present in the bottom layer. If a pink or red color is
present, rewash tube with dilute acid, rinse with distilled water and
start procedure over.

7. Dilute to 10 mL line with pH adjusted Absorbing Solution from Step

3. Cap and shake vigorously for 30 seconds.

8. Allow test tube to stand undisturbed for 1 minute. If bottom layer
remains cloudy shake another 10-15 seconds. Check the pH to ensure
pH is between 9 and 11.

9. Insert test tube into the Lead In Air Comparator (4418). Match
sample color to index of color standards. Record the index number
which gives the proper color match.

10. Repeat Steps 3-9 on a blank of deionized water and subtract result
obtained from test result.

11. Use chart to convert index reading to a concentration. Record as
mg/M3 lead.

NOTE: The sampling period specified in the directions corresponds
to concentrations which may be encountered in ambient air
conditions. High concentrations of pollutants in the atmosphere will
require shorter sampling period, while low concentrations will require
longer sampling periods.

LEAD IN AIR CALIBRATION CHART**

TIME COMPARATOR INDEX NUMBER

(min) 1 2 3 4 5 6 7 8

5

0.0 0.2 0.4 0.8 1.2 1.6 2.0 3.0

10

15

20

**Values
in mg/M

0.0 0.1 0.2 0.4 0.6 0.8 1.0 1.5

0.0 0.07 0.13 0.27 0.4 0.53 0.6 1.0

0.0 0.05 0.1 0.2 0.3 0.4 0.5 0.75

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