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首页> 外文期刊>Applied Engineering in Agriculture >A simple device for the collection of water and dissolved gases at defined depths.
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A simple device for the collection of water and dissolved gases at defined depths.

机译：一种用于在确定的深度收集水和溶解气体的简单设备。

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A device, consisting of a jar fitted with an inlet comprised of a gas-tight check valve and two-way ball valve outlet connected via tubing to a portable peristaltic pump, was constructed to collect water samples without atmospheric contamination or loss of dissolved gases. A headspace void for dissolved gas analysis was created by enclosing silicone tubing sealed with rubber stoppers within the jar. The device was deployed in a 0.4-ha lagoon that served as the primary waste recipient of a 2,000-sow farrowing operation as well as a 4,000-ha impoundment reservoir. Water samples were analyzed for dissolved methane and common indices of water quality such as pH, suspended solids, various ions, and metals concentration. In addition, lagoon wastewater samples were analyzed for malodorous compounds. For reservoir samples, methane concentrations at the bottom of the lake of 60 micro g L-1 were about three orders of magnitude higher than at the upper levels of the lake while ammonium levels increased from 0.03 mg L-1 at the surface to 1.67 mg L-1 in bottom samples. pH steadily decreased from 8.58 near the surface to 7.47 at the bottom. Other water quality parameters such as dissolved metals were similar at each depth. For lagoon samples, ammonium concentration and malodorous compounds declined markedly as temperatures warmed. Results for both reservoir and lagoon sampling indicate that this device affords an inexpensive yet effective means of water collection for subsequent analysis of both water quality and dissolved gas concentration.
机译：装置由一个罐子组成，该罐子装有一个由气密止回阀和通过球阀连接到便携式蠕动泵的双向球阀出口组成的入口，该装置可以收集水样，而不会造成大气污染或溶解气体的损失。通过将用橡胶塞密封的硅胶管封闭在广口瓶内，创建了用于溶解气体分析的顶部空间。该设备被部署在一个0.4公顷的泻湖中，该泻湖是2,000头母猪分娩作业和4,000公顷蓄水池的主要废物接收者。分析了水样中的溶解甲烷和常见的水质指标，例如pH，悬浮固体，各种离子和金属浓度。此外，分析了泻湖废水样品中的恶臭化合物。对于储层样品，湖底的甲烷浓度为60 micro g L -1 ，比湖的上层高约三个数量级，而铵含量从0.03 mg L <表面的sup> -1 到底部样品中的1.67 mg L -1 。 pH值从表面附近的8.58稳定下降到底部的7.47。其他水质参数（如溶解金属）在每个深度都相似。对于泻湖样品，随着温度的升高，铵浓度和恶臭化合物显着下降。储层和泻湖采样的结果表明，该设备提供了一种廉价而有效的集水方式，可用于随后的水质和溶解气体浓度分析。

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