Reference Material for Aqueous Suspended Matter Solution 2000mg/L

**Reference Material Specification** This certified reference material is intended for daily analysis, detection, environmental monitoring, food testing, confirmation of relevant standards and methods, and can also be used for laboratory quality control such as method evaluation and instrument calibration. **I. Sample Preparation** This certified reference material is prepared using solutes of high-purity substances with accurately determined purity, dissolved in ultrapure water. It is accurately prepared by the gravimetric-volumetric method in a clean laboratory at room temperature (20±3)°C. **II. Traceability and Value Assignment** The certified value of this reference material is verified by a certified value, with value verification performed using gravimetric analysis. The traceability of the reference material value is ensured through the use of preparation, measurement methods, and metrological instruments that meet metrological characteristic requirements. **III. Characteristic Values and Expanded Uncertainty** | Component | Certified Value | Expanded Uncertainty (k=2) | Matrix | |----------------|-----------------|----------------------------|-----------------| | Suspended Solids | 2000 mg/L | 75 mg/L | Ultrapure Water | The expanded uncertainty of the certified value is primarily synthesized from uncertainties in raw material purity, weighing, volume measurement, homogeneity, and long-term stability. **IV. Homogeneity Test and Stability Assessment** In accordance with JJF 1343-2022 "Value Assignment and Evaluation of Homogeneity and Stability for Reference Materials," the homogeneity and stability of this reference material are monitored. Results indicate good homogeneity and stability. The reference material is valid for 12 months from the date of value assignment. The developing unit will continue to monitor its stability; any changes during the validity period will be promptly notified to users. **V. Packaging, Storage, and Usage** **Packaging:** This reference material is packaged in polyethylene plastic bottles. Protective measures against breakage should be taken during transportation. **Storage and Usage:** Store under airtight conditions at room temperature. Before use, equilibrate to (20±3)°C and shake thoroughly to ensure homogeneity. Strictly avoid contamination during use. **Declaration:** 1. This reference material is solely for laboratory research and analytical testing. The provider assumes no responsibility for complaints arising from improper use or storage by users. 2. Upon receipt, immediately verify the variety, quantity, and packaging. Compensation is limited to the reference material itself and does not cover any other losses. 3. For more information related to usage, contact the technical consulting department.