442 Formulations
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Units Of Measure “ppm” parts per million (milligram solids per kilogram solution)
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442 Standards are formulated from sodium sulfate, sodium bicarbonate and sodium
chloride in the ratio of 4:4:2 respectively. to represent the composition of natural
surface water such as rivers, lakes and streams.
Custom standards, at other levels are available on request, simply let us know what
you need. Please contact susan@auricalcompany.com or at 800-615-8870 / 650-861-0647.
Accuracy as referenced to NIST Standard Reference Materials or NIST method is ±1.0%
@25°C. Traceability certificates available on request at no additional cost.
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