Immobilized sediment and preparation method and application thereof

A sediment-to-volume ratio technology, applied in the preparation of test samples, biological testing, material inspection products, etc., can solve problems such as toxicity test of very few algae total sediments, and achieve excellent mass transfer performance, good holding capacity, The effect of good diffusivity
CN110376032AActive Publication Date: 2019-10-25SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2019-10-25

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Abstract

The invention relates to an immobilized sediment and a preparation method and application thereof. The preparation method comprises the following steps: step one, taking a sediment, freezing the sediment, drying the frozen sediment, grinding the dried sediment, and sieving the ground sediment to obtain a sediment sample; step two, mixing the sediment sample with a sodium alginate solution uniformly and preparing standby mixed liquid; andstep three, adding the standby mixed liquid into a calcium chloride solution at a uniform speed, carrying out crosslinking to form an immobilized sediment. Theimmobilized sediment has the density of 2.1 to 2.5 g / cm<3>, the surface aperture of the immobilized sediment is 5 nm to 200 nm, and the superficial area of the sediment is 180 to 250cm<2>; and the immobilized sediment has the excellent retention ability and is capable of releasing the contaminants in the sediment continuously. The immobilized sediment can be applied to the total sediment and soiltoxicity testing; the testing process does not limit the growth of algae; and the density of the algae can be determined by a spectrophotometer. The method is simple and is operated rapidly; and measurement is sensitive.
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Description

technical field

[0001] The invention relates to an immobilized sediment and its preparation method and application, belonging to the field of ecological security evaluation. Background technique

[0002] Standard full-effluent toxicity tests use a range of standard aquatic organisms, such as algae, daphnia, duckweed, and fish, but only a few of these organisms are applicable to whole-sediment toxicity tests. Potential toxicity and bioaccumulation of chemicals in whole sediments, typically using a 10-day amphipod (Hyalella Azteca) acute toxicity test or a 4-6 week chironomus tentans chronic toxicity test to evaluate. The long life cycle of these test organisms makes the experiments costly and labor intensive. Compared with these invertebrates, algae, as producers of aquatic ecosystems, are more sensitive to many toxic substances, have a short growth cycle, are easy to cultivate, and can directly observe toxic effects at the cellular level. However, whole-sediment toxicity ...

Claims

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