| 摘要 |
<p>Reagent is made by placing 1-300 litres of water, free from impurities, in a suitable container at ambient temp., adding 2-200 l of iron sulphate, agitating the mixt. until the iron sulphate is completely dissolved, and allowing the soln. to stand for approx. 10 hrs. with the container well closed.</p> |
