在样条伸展入海的位置取海水样本。
Collect water sample from the site where transect line runs into the sea.
若样条经过小溪，也取小溪的水样本。
If there is a stream nearby, also collect some stream water.
把大约5亳升的浓硫酸加进100亳升的水样本中，混匀。
Add 5 ml. concentrated sulphuric acid to 100 ml. water sample and shake well.
把大约5亳升的浓硫酸加进100亳升的水样本中，混匀。
Add 5 ml. concentrated sulphuric acid to 100 ml. water sample and shake well.
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