EQUIPMENT

  1. Thermo Jarrell-Ash Model 61E ICP
  2. Thermo Jarrell-Ash Autosampler 300
  3. 48 position rectangular sample racks

ICP PARAMETERS

1 Units: ppm
2 Integration time: 10 seconds
3 Flush time: 45 seconds
4 Background correction: Yes
5 Blank correction: No
6 Torch Gas: High Flow
7 Auxiliary Gas Flow: Medium (1.0L/min.)
8 Nebulizer Press. (PSI) 33 (adjustable)
9 Approximate RF power: 1150 watts
10 Analysis Pump Rate: 70-130 rpm (adjustable)
11 Flush Pump Rate: 70-130 rpm (adjustable)
12 Purge: On

ICP WAVELENGTHS

1 P 1782
2 K 7664
3 Ca 3179
4 Mg 2790
5 Mn 2576
6 Fe 2599
7 Al 3082
8 B 2496
9 Cu 3247
10 Zn 2138
11 Na 5889
12 Pb 2203
13 Cd 2265
14 Ni 2316
15 Cr 2677
16 Mo 2020

STANDARDS

  1. Stock Solutions: Use 1000 ppm certified, NIST traceable, plasma grade standards for the 16 listed elements.
  2. Instrument Calibration Standards:
    1. WAT1 - deionized water.
    2. WAT2 - 10 ppm all elements - Pipet 10 mL of each stock solution into a 1 liter volumetric flask. Add 5 mL of nitric acid. Dilute to volume with deionized water and mix well. Store in a plastic bottle. Record the preparation date and the stock solution expiration dates each time a new standard is prepared. Do not use any stock solution past its expiration date.
  3. Instrument Calibration Verification Standards:
    1. A second set of calibration standards obtained from a different supplier.

ICP PROCEDURE

  1. Follow the manufacturer's instructions in order to initiate the plasma and the autosampler.
  2. Select WATER from the methods menu.
  3. Setup an autosampler table for the set being analyzed.
  4. Analyze the samples using the autosampler table.
    1. This table includes instrument calibration standards, the calibration verification standard, quality control samples, as well as client samples.

QUALITY CONTROL

  1. Following calibration, analyze one WAT2 standard, one instrument calibration verification standard, and two quality control samples.
    1. WAT2 Standard: Values must be within 3% of the known value for K and Mo. All other elements must be within 2% of the known values.
    2. Instrument Calibration Verification Standard: All values must be within 10% of the certified values.
    3. Quality Control Samples: Values on at least 14 of the 16 elements reported must lie within the " advisory range" established by the supplier of these samples.
  2. Analyze one WAT2 standard following the last client sample.
    1. Values for all elements must be within 8% of the known values.

REFERENCE

  1. Maxfield, R. And B. Mindak. 1985. EPA Method Study 27, Method 200.7 (Trace Metals by ICP). EPA-600/S4-85/05. National Technical Information Service.