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To raise boron by 0.5 ppm in 100 L: 7.2 ml.
40 g/L x 0.1748 = 6.99 g/L B.
• Natural seawater ~4.4 ppm B; dose only if a test (ICP preferred) shows low B.
• Toxic if ingested in quantity; reproductive toxicant (EU classification) - handle carefully.
• Solubility ~47 g/L at 20 C; use stocks <=40 g/L.
40 g made up to 1 L total.