Graphite Furnace Calibration Standards
Metals: As, Pb, Se, Sb
Intermediate Standard
0.5 mL of each conc. 1000 ppm standard à 200 mL DI water (2.5 ppm)
Calibration Standard
5.0 mL of Intermediate 2.5 ppm à 250 mL DI water (50 ppb)
Spiking Standard
10.0 mL of Intermediate 2.5 ppm à 250 mL DI water (100 ppb)
Drinking Water Lead: Dilute Standard 1:1 Before Loading on GFAA
Metals: Cd
Intermediate Standard#1
0.5 mL of conc. 1000 ppm standard à 200 mL DI water (2.5 ppm)
Intermediate Standard#2
10 mL of intermediate#1 à 100 mL DI water (0.25 ppm)
Calibration Standard
1 mL of intermediate#2 à 250 mL DI water (1.0 ppb)
Spiking Standard
2 mL of intermediate#2 à 250 mL DI water (2.0 ppb)
Metals: Ag
Intermediate Standard
0.5 mL of conc. 1000 ppm standard à 200 mL DI water (2.5 ppm)
Calibration Standard
0.5 mL of intermediate 2.5 ppm à 250 mL DI water (5.0 ppb)
Spiking Standard
1.0 mL of intermediate 2.5 ppm à 250 mL DI water (10.0 ppb)
ICP Standards and Reagents
Internal Standard-Yttrium
Concentrated 1000 ppm Yttrium
1.2699 g of Yttrium(III) Oxide (O3Y2) à 1000 mL of DI water = 1000 ppm Yttrium
Internal Standard
10 mL of 1000 ppm Yttrium + 2 g Cesium Chloride powder à 1000 mL DI Water
ICP Tuning Solution
50 mL concentrated Tuning Solution + 10 mL HNO3 à 500 mL DI Water
ICP Calibration Standards
See ICP calibration standards chart
ICP Matrix Spiking
200 uL of each concentrated calibration standard à 50 mL of sample (400 ppb spike for most elements)
Mercury Calibration Standards
Mercury Working Standard
Intermediate
2 mL of 1000 ppm Hg standard à 100 mL DI water (20 ppm)
Working Standard
1 mL of 20 ppm Intermediate à 200 mL DI water (100 ppb working standard)
Mercury Calibration Standards
Prepared fresh for each calibration run
1 ppb: 1 mL of working standard à 100 mL DI water
3 ppb: 3 mL of working standard à 100 mL DI water
5 ppb: 5 mL of working standard à 100 mL DI water
10 ppb: 10 mL of working standard à 100 mL DI water
Mercury Low and High QC
Concentrations vary depending on the source and true value of the purchased QC standards.
Dilute purchased standards accordingly to give a low concentration and a higher concentration.
Tungsten Standards
2.5 ppm Tungsten: 0.5 mL conc 1000 ppm W à 200 mL DI water
10 ppm Tungsten: 2 mL conc 1000 ppm W à 200 mL DI water
50 ppm Tungsten: 10 mL conc 1000 ppm W à 200 mL DI water
Tin Standards
Instead of using HNO3 as an acid matrix, add 15 mL of HCL to each standard.
200 ppb Sn: 0.5 mL of 100 ppm Sn à 250 mL DI water
400 ppb Sn: 1.0 mL of 100 ppm Sn à 250 mL DI water
800 ppb Sn: 2.0 mL of 100 ppm Sn à 250 mL DI water
QA/QC Standards
Prepared from concentrated QC-7 and QC-21 standards
500 ppb QC
5 mL of QC-7 + 5 mL of QC-21 à 1000 mL DI water
50 ppb QC
0.5 mL of QC-7 + 0.5 mL of QC-21 à 1000 mL of DI water
10 ppb QC (graphite)
5 mL of 500 ppb QC à 250 mL DI water
40 ppb QC (graphite)
20 mL of 500 ppb QC à 250 mL DI water
1.0 ppb QC (graphite)
0.5 mL of 500 ppb QC à 250 mL DI water
4.0 ppb QC (graphite)
2 mL of 500 ppb QC à 250 mL DI water
0.25 ppb QC (graphite)
1 mL of 50 ppb QC à 200 mL DI water