Reference Material for Aqueous Suspended Matter Solution 1000mg/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 formulated 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. Traceability of the reference material value is ensured through 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 | 1000 mg/L | 48 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** According to JJF 1343-2022 "Value Assignment and Evaluation of Homogeneity and Stability for Reference Materials," the homogeneity and stability of the material were monitored. Results confirm good homogeneity and stability. Valid for 12 months from the date of value assignment. The developing unit will continue monitoring stability and notify users of any changes during the validity period. **V. Packaging, Storage, and Usage** **Packaging:** Polyethylene plastic bottles. Protective measures against breakage must be taken during transportation. **Storage & Usage:** Store under airtight conditions at room temperature. Before use, equilibrate to (20±3)°C and shake thoroughly to ensure homogeneity. Strictly prevent 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. 2. Immediately verify product type, quantity, and packaging upon receipt. Compensation is limited to the reference material itself. 3. For usage-related inquiries, contact the technical consulting department.