First, a simple method for measuring dissolved oxygen involves using a siphon pond to collect 260 ml of water sample and transfer it into a 250 ml volumetric flask. Immediately after sampling, fix the dissolved oxygen by adding 0.5 mg each of manganese sulfate and basic potassium iodide. This causes the formation of a flocculent precipitate, which should be stirred thoroughly. Next, add 0.5 ml of concentrated sulfuric acid (with a density of 1.84 g/cm³) to acidify the precipitate. At this stage, compare the color of the sample with a standard color chart that corresponds to different dissolved oxygen levels. The color comparison can help estimate the dissolved oxygen content in the water. For example: Brown indicates dissolved oxygen of 10 mg/L or higher (high oxygen is favorable); brownish yellow suggests 6.3–7.1 mg/L (safe and harmless); orange corresponds to 4.4–5.1 mg/L (caution required); pale yellow means 1.5–2.1 mg/L (risk of hypoxia); and gray or white indicates less than 1 mg/L (extremely dangerous). This method provides a quick and practical way to assess water quality in ponds. Second, when adding drugs to pellet feed, it's important to follow a proper procedure to ensure even distribution and effectiveness. For instance, if the desired drug concentration is 15%, mix 150 g of the drug with 30 g of a drug binder first. Then, add 1000 ml (1 kg) of clean, room-temperature water and stir continuously while mixing. After 10 minutes, when the mixture becomes viscous, gradually incorporate it into 10 kg of feed. Finally, dry the treated feed in a shaded area to avoid direct sunlight, which could degrade the active ingredients of the drug. Important precautions include ensuring that both the drug and the binder are completely dry before mixing. Moisture can reduce the efficacy of the drug and affect the binding process. Additionally, the drug and binder should be mixed thoroughly in a dry state before being added to the water. When adding the mixture to the water, do so slowly while continuing to stir to prevent clumping and ensure uniform distribution throughout the feed. Following these steps helps maintain the quality and effectiveness of the medicated feed.
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