Multiparameter standard solution for water-quality analysis
AssigneeU.S. Geological Survey
InventorsBrian Anthony Pellerin, Angela Merleen Hansen
Life of this patent
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Abstract
A multiparameter standard solution for verifying and calibrating water quality sensors containing an aqueous pH buffer, a xanthene dye, and distyryl biphenyl (DSBP) is provided. The standard solution provides a safe, quick, easy, and stable field standard to simultaneously conduct calibration analysis for several sensors at once. The standard solution is stable when stored and can be safely disposed of in the field. Methods of calibrating sensors used in water quality analysis using the multiparameter standard solution are also provided.
Claims20
A standard solution comprising:
- an aqueous pH buffer;
- a xanthene dye;
- and
- distyryl biphenyl
- (DSBP);
- wherein the buffer is
- from 9 to 11 wherein said solution is for verifying and calibrating water quality sensors.
A method of verifying or calibrating a sensor used in water quality analysis, the method comprising:
- (i) contacting the sensor with a standard solution comprising an aqueous pH buffer, a xanthene dye, and distyryl biphenyl (DSBP), the standard solution having one or more known property that is measurable by the sensor;
- (ii) analyzing the one or more property with the sensor and taking a calibration measurement;
- and
- (iii) determining whether or not the sensor is calibrated based on the calibration measurement.
A method of performing water quality analysis, the method comprising:
- (i) contacting a sensor used in water quality analysis with a standard solution comprising an aqueous pH buffer, a xanthene dye, and distyryl biphenyl (DSBP), the standard solution having one or more known property that is measurable by the sensor;
- (ii) analyzing the one or more property with the sensor and taking a calibration measurement;
- (iii) determining whether or not the sensor is calibrated based on the calibration measurement;
- (iv) when determining that the sensor is not calibrated, adjusting the sensor and repeating steps (i)-(iii), and when determining that the sensor is calibrated, performing steps (v-vi);
- (v) contacting the calibrated sensor with a sample for water quality analysis;
- and
- (vi) analyzing the sample for water quality.
Dependencies are inferred from the claim text.