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

Active Publication Date: 2019-10-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, whole-sediment toxicity testing with algae is rarely performed due to the difficulty in distinguishing and counting algal cells in the presence of sediment particles and the fact that the presence of sediment limits algal growth due to light blocking
Although there have been attempts to conduct sediment toxicity experiments using marine benthic algae in recent years, this method is only applicable to sandstone sediments with large particle sizes, which is very different from most sediments in nature

Method used

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  • Immobilized sediment and preparation method and application thereof
  • Immobilized sediment and preparation method and application thereof
  • Immobilized sediment and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for preparing an immobilized deposit, the method comprising the steps of:

[0031] 1) Take the sediment (sediment or soil) and use a freeze dryer to freeze-dry. The freeze-drying conditions are: the temperature of the freeze-trap is -50°C, the pumping speed of the vacuum pump is 125L / min, and then it is ground with a quartz grinding plate and passed through a 60-mesh sieve. obtaining sediment samples;

[0032] 2) Mix the sediment sample with sodium alginate solution (the mass volume ratio of sodium alginate and solvent water is 5g:100mL) according to the mass volume ratio of 1g:5ml, and stir for 2min at a stirring frequency of 10r / s. Mix evenly to make a spare mixture;

[0033] 3) Maintain a speed of 2ml / s in the vertical direction, squeeze the spare mixed solution into the calcium chloride solution (the mass volume ratio of calcium chloride to solvent water is 5g:100mL) at a constant speed, and alternately The combined time is 25min to form fixed deposits; ...

Embodiment 2

[0041] A method for preparing an immobilized deposit, the method comprising the following steps:

[0042] 1) Take the sediment (sediment or soil of the river course) and freeze-dry it with a freeze dryer. The freeze-drying conditions are: the temperature of the freeze trap is -65°C, the pumping speed of the vacuum pump is 100L / min, and then it is ground with a quartz grinding plate and passed through 100 mesh. Sieve to obtain sediment samples;

[0043] 2) Mix the sediment sample with sodium alginate solution (the mass volume ratio of sodium alginate and solvent water is 2g:100mL) according to the mass volume ratio of 1g:10ml, and stir for 5min at the stirring frequency of 2r / s, Mix evenly to make a spare mixture;

[0044] 3) Maintain a speed of 0.2ml / s in the vertical direction, squeeze the spare mixed solution into the calcium chloride solution (the mass volume ratio of calcium chloride to solvent water is 2g:100mL) at a constant speed, and at a temperature of 23°C, The cross...

Embodiment 3

[0052] A method for preparing an immobilized deposit, the method comprising the steps of:

[0053] 1) Take the sediment (sediment or soil of the river course) and freeze-dry it with a freeze dryer. The freeze-drying conditions are: the temperature of the freeze trap is -60°C, the pumping speed of the vacuum pump is 110L / min, and then it is ground with a quartz grinding plate and passed through 80 mesh. Sieve to obtain sediment samples;

[0054] 2) Mix the sediment sample with sodium alginate solution (the mass volume ratio of sodium alginate and solvent water is 3g:100mL) according to the mass volume ratio of 1g:7ml, and stir for 3min at a stirring frequency of 5r / s, Mix evenly to make a spare mixture;

[0055] 3) Maintain a speed of 1ml / s in the vertical direction, squeeze the spare mixed solution into the calcium chloride solution (the mass volume ratio of calcium chloride to solvent water is 3g:100mL) at a constant speed, and alternately The combined time is 30min to form...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/38G01N1/42G01N33/24G01N33/50
CPCG01N1/28G01N1/38G01N1/286G01N1/42G01N33/24G01N33/5014G01N2001/2866G01N2001/386
Inventor 孙丽伟裴舟韬张静王文强徐柔柔张萌张李凌王文倩
Owner SOUTHEAST UNIV
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