為探討河水中二氧化碳和甲烷的釋放，會在採樣到測量的過程中添加氯化汞以抑制微生物活性。但氯化汞對這些水體中溫室效應氣體釋放的影響未知。因此，將不同體積飽和氯化汞溶液(69 mg/mL, 20oC)添加至淡水河水樣中於25oC下培養6天。100 mL河水二氧化碳和甲烷釋放量隨飽和氯化汞添加量增加而減少，當飽和氯化汞添加量大於100 μL (6.9 mg)時，其釋放量減少速率減緩。褐色瓶中水體二氧化碳和甲烷釋放量較無色瓶高。下游水體二氧化碳和甲烷釋放量最高，中游水體次之，而上游水體最低。因下游水體污染量較高，BOD、COD和SOM亦較高。因而水體取樣時於100 mL水體中添加100 μL飽和氯化汞溶液，降低微生物活性，於利實驗室測量水體溫室氣體釋放量為一可行之方式。

To investigate carbon dioxide and methane emissions from the river water, mercuric chloride was added to the water for retarding microbial activities during the period from water sampling to laboratory measurement. But the effects of mercuric chloride on emissions of these green house gases from water remain unknown. Therefore, carbon dioxide and methane emissions from water of Tamsui River with different
amounts of saturated mercuric chloride solution (69 mg/mL at 20oC) were determined at 25oC for 6 days.Carbon dioxide and methane emissions decreased with increasing amount of saturated mercuric chloride
solution added from 50 to 600 μL (3.45-41.4 mg) in 100 mL water. The gas emissions decreased slightly when the amount of saturated mercuric chloride was higher than 200 μL (13.8 mg). Carbon dioxide and methane
emissions decreased linearly with the amount of saturated mercuric chloride supplemented between 0 and 100 μL (0-6.9 mg). The effect of bottle color on the carbon dioxide and methane emissions was studied
with colorless and brown-colored bottles. Water in the brown-colored bottles had higher carbon dioxide and methane emissions than in the colorless bottles. The downstream area of Tamsui River had the highest
carbon dioxide and methane emissions, followed by the middle-stream area, and the upstream area was the lowest due to the high pollution in the downstream area. Therefore, addition of 100 μL saturated mercuric
chloride solution (6.9 mg) in 100 mL of water to retard the microbial activities after sampling in the fields for measurement of greenhouse gases emissions from water is a feasible method.