ASTM D6071 Standard Test Method for Low Level Sodium in High Purity Water by Graphite Furnace Atomic Absorption Spectroscopy

Get Certified ASTM D6071 Low-Level Sodium Testing

ASTM D6071 testing is valuable for industries and facilities that need high-purity water with controlled sodium levels. Technicians take samples and prepare necessary calibrations and analytical equipment with proper handling procedures. The technician compares water sample to the prepared water sample and analyzes the prepared water sample in a graphite furnace atomic absorption spectrometer, then documents the analytical response and test conditions. Analysts review the calibration data and measured results to determine the sodium concentration. The results assist with water quality monitoring, process control, contamination assessment, quality assurance, and verification of high-purity water systems.

• Low Level Sodium Determination: Methods that apply to low concentrations of sodium in high purity water. 
• High-Purity Water Analysis: Analyzes water samples where low sodium levels can be significant. 
• Graphite Furnace Atomic Absorption Spectroscopy (GFAAS): Measuring sodium using atomic absorption spectroscopy with graphite furnace. 
• Calibration: Uses appropriate calibration procedures to relate the measured analytical response to sodium concentration. 
• Contamination Control: Care must be taken to ensure that samples are handled and prepared in a way that will reduce the risk of contaminating with sodium. 
• Water Quality Monitoring: Assesses the quality of sodium concentration in suitable high-quality water systems.

What are the uses of ASTM D6071 testing?

ASTM D6071 includes low-level sodium concentration data to aid in the judgment of high-purity water quality by technical personnel. The test helps to:

• Determine low concentrations of sodium in high-purity water. 
• Monitor high-purity water quality. 
• Detect changes in sodium concentration. 
• Support contamination monitoring. 
• Compare water samples from different production or treatment stages. 
• Support quality-control and process-monitoring activities. 
• Provide analytical data for high-purity water management. 

Which materials can be tested according to ASTM D6071?

ASTM D6071 applies to high-purity water samples for which low-level sodium determination is required. The method applies to:

• High-Purity Water: Evaluates applicable high-purity water samples. 
• Process Water: Supports sodium monitoring in applicable purified-water systems. 
• Treated Water Samples: Allows evaluation of water following applicable purification or treatment processes. 
• Quality-Control Samples: Supports monitoring of representative water samples. 
• Reference and Calibration Solutions: Uses appropriate solutions to establish and verify analytical measurements. 

Why is ASTM D6071 testing important?

Sodium is an important parameter in high-purity water because the presence of even small amounts can signify contamination or malfunction of the water purification system. Measurement of low sodium content can therefore aid the monitoring and control of high-purity water systems. The ASTM D6071 standard offers a standardized analytical method with the use of graphite furnace atomic absorption spectroscopy. The results enable technicians and engineers to determine changes in sodium concentration, to provide information on water quality, and to assist with quality-control activities.

ASTM D6071 Testing Process and Data Collection

Technicians first locate the high-purity water source, then sample with clean handling procedures. They make the necessary calibration standards and quality control solutions and check the state of the graphite furnace atomic absorption spectrometer. The technician introduces the prepared sample into the analytical system and performs the sodium measurement under the applicable conditions. It forms an analytical response related to the sodium detected in the sample. Technicians record the sample identification, calibration information, instrument response, and relevant analytical conditions. The calibration data helps analysts to calculate the sodium concentration and review it for reporting.

Common Challenges and Troubleshooting

ASTM D6071 varies due to sample contamination, improper cleaning of containers, contamination from reagents or equipment, inaccurate calibration, instrument instability, incorrect sample handling, and analytical interference. Technicians will employ proper clean handling techniques and prepare samples and calibration solutions with care. Before analysis, the analysts should check the condition of the graphite furnace of the atomic absorption spectrometer and its calibration. When results are not as expected, technicians should check the sampling procedure, sample container, sodium contamination, preparation of the calibration, instrument performance, analytical conditions, and data calculations.

• ASTM D6071 gives results based on the concentration of sodium, not one overall water quality value. 
• Sodium concentration should be reported as noted by the appropriate SI concentration units defined by the selected procedure (µg/L or mg/L, as appropriate). 
• The report should contain the identification of the water-source or sample and sampling details. 
• Analysts record calibration and quality control data pertinent to the results.
• Technicians and analysts can achieve both reliable and comparable results by carefully monitoring contamination, properly calibrating equipment, using proper analytical procedures, and keeping equipment in good condition. 

Link to ASTM D6071