1. Adhere to the instructions of test procedures. 2. Store test kits at 4-30˚C when not in use, and do not use the kits beyond the expiration date. 3. Please don’t touch the membrane on the strips. 4. Remove microwell sealer slightly to prevent the powder from being released from the wells. 5. Avoid direct sunlight and direct blows during testing. 6. Do not re-use pipette tips, test strips or microwells. 7. The unsealed microwells should be used within 1 hour. 8. This test method is just used for rapid screening purpose; if positive results are occurred，please verify them by a quantitative method. 9. Methanol/ Ethanol are flammable. Caution must be taken in its use and storage. 10. Please avoid direct sunlight or blowing when testing. 11. Do not take tap-water, distilled water or deionized water as a negative control. 12. Considering that all materials, containers and devices exposed to the sample are contaminated with toxins, please wear protective gloves and safety glasses while using a kit. 13. The components in this test kit have been quality control tested as a standard batch unit. Do not mix components from different lot numbers. 14. If the sample extract is too alkaline (pH＞9) or acid (pH＜5), please adjust the pH value of the sample extract to be 6.0-8.0 by using NaOH or HCl (2.0 mol/L) before dilution. 15. Any problem encountered during usage, please contact with the supplier.