METHOD #: 255.2

TITLE:

ANALYTE:

INSTRUMENTATION:
STORET No.

Optimum Concentration Range:
Detection Limit:

Approved for NPDES (Issued 1978)
Platinum (AA, Furnace Technique)
CAS # Pt Platinum 7440-06-4
AA

Total Not Assigned

0.1-2 mg/L
0.02 mg/L

1.0 Preparation of Standard Solution

1.1	Stock solution: Prepare as described under "direct aspiration method".

1.2	Prepare dilutions of the stock solution to be used as calibration standards at
the time of analysis. These solutions are also to be used for "standard
additions".

1.3	The calibration standard should be diluted to contain 0.5% (v/v) HNOs.

2.0 Sample Preservation

2.1 For sample handling and preservation, see part 4.1 of the Atomic Absorption
Methods section of this manual.

3.0 Sample Preparation

3.1 Prepare as described under "direct aspiration method". Sample solutions for
analysis should contain 0.5% (v/v) HNOs.

4.0 Instrument Parameters (General)

4.1.	Drying Time and Temp: 30 sec-125°C.

42.	Ashing Time and Temp: 30 sec-1300°C.

4.3.	Atomizing Time and Temp: 10 sec-2800°C.

4.4.	Purge Gas Atmosphere: Argon

4.5.	Wavelength: 265.9 nm

4.6.	Other operating parameters should be set as specified by the particular
instrument manufacturer.

5.0 Analysis Procedure

5.1. For the analysis procedure and the calculation, see "Furnace Procedure" part
9.3 of the Atomic Absorption Methods section of this manual.

6.0

Notes

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6.1.	The above concentration values and instrument conditions are for a
Perkin-Elmer HGA- 2100, based on the use of a 20 /jL injection, continuous
flow purge gas and pyrolytic graphite. Smaller size furnace devices or those
employing faster rates of atomization can be operated using lower atomization
temperatures for shorter time periods than the above recommended settings.

6.2.	The use of background correction is recommended.

6.3.	Nitrogen may also be used as the purge gas.

6.4.	For every sample matrix analyzed, verification is necessary to determine that
method of standard addition is not required (see part 5.2.1 of the Atomic
Absorption Methods section of this manual).

6.5.	If method of standard addition is required, follow the procedure given earlier
in part 8.5 of the Atomic Absorption Methods section of this manual.

Precision and Accuracy

7.1. Precision and accuracy data are not available at this time.

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