Test Procedures
APPLICATION:
Drinking and surface waters; domestic and industrial
wastewaters.
RANGE:
0.00–5.00 Lead
MDL:
0.10 ppm
METHOD:
Lead and calcium ions form a red complex with PAR
(4-(2’-pyridylazo)resorcinol), at a pH of about 10. When
sodium diethyldithiocarbamate is added, the lead/PAR
complex is destroyed leaving the calcium/PAR complex. The
diff erence between the two measurements is due to the lead
concentration.
SAMPLE HANDLING &
PRESERVATION:
Analyze sample as soon as possible. If sample must be stored,
acidify with nitric acid to a pH of below 2.
INTERFERENCES:
Calcium greater than 100 ppm (250 ppm CaCO
3
) will interfere.
Low concentrations of cerium, iron, manganese, magnesium,
sulfur, tin, and EDTA will also interfere.
LEAD
SMART Spectro 2 Test Procedures 05.02.16
www.
GlobalScientificSupply
.com
GLOBAL SCIENTIFIC SUPPLY
The Laboratory Supply Company!
