Device and method for study on release of heavy metals and/or phosphate in sediments

A sediment and heavy metal technology, applied in the field of water ecology research, can solve the problems of less research on the impact of physical and chemical changes, and achieve the effect of strong applicability

Inactive Publication Date: 2013-10-23
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In most cases, this type of research focuses on the release of pollutants from sediments under various conditions, and th

Method used

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  • Device and method for study on release of heavy metals and/or phosphate in sediments
  • Device and method for study on release of heavy metals and/or phosphate in sediments
  • Device and method for study on release of heavy metals and/or phosphate in sediments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] A slightly polluted lake sediment is selected as the research object, and the collected surface sediment and filtered raw water samples are placed in the sediment-water interface system. The main body of the system is a water tank 31 with a specification of 80cm× 60cm×45cm, containing 16cm of sediment and 8cm of water sample filtered by a 0.45μm filter membrane, the flow rate of the water sample is 0-2L / min, the first baffle 35 is 10cm away from the water inlet, each baffle 35 are 10cm apart, and the microelectrode control system is 20cm away from the right side of the water tank 31. The microelectrode control system is produced by Unisense, Denmark, and consists of a four-channel host, a motor controller 22, a pH probe 26, a DO probe 28, and an ORP probe. 27. The reference electrode 29 is composed of a DO probe 28 with a diameter of 25 μm, a pH probe 26 and an ORP probe 27 with a diameter of 1 mm, and a reference electrode 29 with a diameter of 8 mm. The motor controlle...

Embodiment 2

[0071] Select a moderately polluted lake sediment as the research object, place the sediment-water interface system in Example 1 with the surface sediment and the filtered raw water sample of the collection, the sediment of 16cm and the sediment of 8cm The water samples filtered by 0.45μm filter membrane, the flow rate of water samples is 0~2L / min, also equipped with microelectrode system, plate heavy metal and phosphate DGT, to study the sediment when the dissolved oxygen content is 40% and 90%. Release of heavy metals and phosphates. The results showed that as the experiment progressed, the DO content in the sediments began to decrease along the section direction, from about 130 μM to 0 μM, and the lowest point appeared at about 2-3 cm, which indicated that most of the heavily polluted lake sediments were in an anaerobic state. The dissolved oxygen content is low. When the dissolved oxygen content was 40% and 90%, the pH and ORP content in the sediment also showed a trend o...

Embodiment 3

[0073] A heavily polluted lake sediment was selected as the research object, and the collected surface sediment and the raw water sample filtered through a 0.45 μm filter membrane were placed in the sediment-water interface system in Example 1, and a total of 16 cm of water was installed. Sediment and 8cm of water sample filtered by 0.45μm filter membrane, the flow rate of the water sample is 0-2L / min, the system is also equipped with a microelectrode system, plate-type heavy metal and phosphate DGT, and the dissolved oxygen content is studied between 40% and 90% of the time, the release of heavy metals and phosphate in the sediment. The results show that: due to the serious pollution, the dissolved oxygen content of the sediment along the section drops quickly from 95 μM to 0 μM, and the lowest point appears at about 1-2 cm. When the dissolved oxygen content is 40% and 90%, the pH and ORP changes of the sediment along the profile direction generally show a downward trend, fro...

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Abstract

Provided is a device for study on release of heavy metals and/or phosphate in sediments. The main body of the device is a sediment-water interface system and a dissolved oxygen control device. The sediment-water interface system is composed of a tank. The bottom of the water tank is parallelly inserted with a plurality of sets of plate-type DGTs along the length direction of the central line. A microelectrode control system is arranged at the top of the water tank. The microelectrode control system is composed of a four-channel host, a motor controller, and pH, DO, ORP probes. Both sides of the tank are engraved with grooves. Staggered baffle plates are arranged in the grooves. A joint is arranged at one end of the water tank and connected with the dissolved oxygen control device through a peristaltic pump. A joint of the other end of the water tank is close to the upper liquid surface and connected with the dissolved oxygen control device directly. The dissolved oxygen control device is a water tank. The water tank contains a filtered water sample inside. Two joints are arranged at the top of the tank. One ends of the joints are respectively connected with a N2 steel cylinder and an O2 steel cylinder. The other ends of the joints are connected with aeration heads. The aeration heads extend into water for aeration. The invention also discloses a method for study on release of heavy metals and phosphate in sediments.

Description

technical field [0001] The invention belongs to the field of water ecology research, in particular to a device for simulating the release of heavy metals and / or phosphates in sediments. [0002] The invention also relates to a method for studying the release of heavy metals and / or phosphates in sediments using the device described above. Background technique [0003] In the biogeochemical cycle of lakes, sediments play the dual roles of source and sink at the same time. Pollutants such as nitrogen, phosphorus, and heavy metals in sediments can be released through physical, chemical, and biological exchanges between interstitial water and overlying water. into the body of water. This process affects the concentration of nutrient components in the overlying and interstitial waters, resulting in a concentration gradient across the sediment-water interface. Along this concentration gradient, pollutants are continuously released or deposited at the sediment-water interface, mak...

Claims

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Application Information

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IPC IPC(8): G01N27/416
Inventor 霍守亮席北斗张靖天
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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