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Detection method for calcium and magnesium ions in straw ash

A detection method and technology for calcium and magnesium ions, which are applied in the field of chemical analysis and detection, can solve the problems of low measured value, inability to completely extract calcium and magnesium ions from straw ash, mass loss, etc. Effect

Inactive Publication Date: 2019-10-08
南京三聚生物质新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hot leaching method is easy to cause mass loss, and at the same time, it cannot completely extract all the calcium and magnesium ions in the straw ash, which makes the measured value low

Method used

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  • Detection method for calcium and magnesium ions in straw ash
  • Detection method for calcium and magnesium ions in straw ash
  • Detection method for calcium and magnesium ions in straw ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment measures calcium oxide, magnesium oxide in the rice husk ash:

[0034] Weigh 0.1 g of rice husk ash (accurately 0.0001 g), add 5 mL of nitric acid, 2 mL of hydrofluoric acid, and 1 mL of hydrogen peroxide. Use the microwave digestion instrument as required. The specific conditions for microwave digestion are:

[0035]

[0036] Get off the machine, drive the acid to the size of soybeans at 130°C, and then transfer the sample liquid into a 100mL volumetric flask to constant volume.

[0037] Determination of total calcium and magnesium: draw 10mL of sample solution into a 250mL Erlenmeyer flask, add water to 50mL; add 2mL of triethanolamine (1+1) solution, shake well; add ammonia-ammonium chloride buffer solution (PH=10) 5mL, mix well; add K-B indicator (0.1g-0.2g), mix well, titrate with 0.01mol / L EDTA solution, record volume V1.

[0038] Determination of calcium content: draw another 10 mL of sample solution into a 250 mL Erlenmeyer flask, add...

Embodiment 2

[0052] The present embodiment measures calcium oxide, magnesium oxide in the rice husk ash:

[0053] Weigh 0.1g of rice husk ash (accurately 0.0001g), add 5mL of nitric acid, pretreat at 130°C for 30min, cool slightly, add 2mL of nitric acid (to supplement the nitric acid lost in pretreatment), 2mL of hydrofluoric acid, and peroxide Hydrogen 1 mL. Use the microwave digestion instrument as required. The specific conditions for microwave digestion are:

[0054]

[0055] Get off the machine, drive the acid to the size of soybeans at 130°C, and then transfer the sample liquid into a 100mL volumetric flask to constant volume.

[0056] Determination of total calcium and magnesium: draw 10mL of sample solution into a 250mL Erlenmeyer flask, add water to 50mL; add 2mL of triethanolamine (1+1) solution, shake well; add ammonia-ammonium chloride buffer solution (PH=10) 5mL, mix well; add K-B indicator (0.1g-0.2g), mix well, titrate with 0.01mol / L EDTA solution, record volume V1.

...

Embodiment 3

[0071] The present embodiment measures calcium oxide, magnesium oxide in the rice husk ash:

[0072] Weigh 0.1g of rice husk ash (accurately 0.0001g), add 5mL of nitric acid, pretreat at 130°C for 30min, cool slightly, add 2mL of nitric acid (to supplement the nitric acid lost in pretreatment), 2mL of hydrofluoric acid, and peroxide Hydrogen 1 mL. Use the microwave digestion instrument as required. The specific conditions for microwave digestion are:

[0073] 150℃ 05min

[0074] 180℃ 05min

[0075] 200℃ 15min

[0076] Get off the machine, drive the acid to the size of soybeans at 130°C, and then transfer the sample liquid into a 100mL volumetric flask to constant volume.

[0077] Determination of total calcium and magnesium: draw 10mL of sample solution into a 250mL Erlenmeyer flask, add water to 50mL; add 2mL of triethanolamine (1+1) solution, shake well; add ammonia-ammonium chloride buffer solution (PH=10) 5mL, mix well; add K-B indicator (0.1g-0.2g), mix well, titrate...

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Abstract

The invention discloses a detection method for calcium and magnesium ions in straw ash, and belongs to the technical field of chemical analysis detection. According to the detection method, nitric acid, hydrofluoric acid and hydrogen peroxide are added into the straw ash to carry out microwave digestion. After microwave digestion, a solid sample is completely digested into a clear transparent solution, loss of the calcium and magnesium ions is low, the sample reproducibility is high, and no impurity ions are introduced. The straw ash is pre-treated in nitric acid before microwave digestion, sothat the detection data is highly parallel. After pretreatment, an EDTA titration method or inductively coupled plasma emission spectrometry is used to detect content of the calcium and magnesium ions in the sample, thus, the method is simple, and the time cost is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical analysis and detection, in particular to a method for detecting calcium and magnesium ions in straw ash. Background technique [0002] Trace elements in calcium magnesium phosphate fertilizer (FMP) can maintain the balance between soil and crop nutrition supply and demand, increase the fertilizer efficiency of farmyard manure, promote the growth of seedlings, prevent freezing and insects, etc. Calcium and magnesium can play a very good role in improving the soil, and at the same time have a ripening effect on newly reclaimed wasteland, which can quickly increase soil fertility. Data have shown that the presence of large amounts of magnesium is beneficial for plant growth. Due to the unique effect of FMP on crops, it has played an increasingly important role in the fertilizer market in recent years. The detection of calcium and magnesium content is one of the important indicators to measure calc...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/73G01N1/44
CPCG01N1/44G01N21/73G01N21/78
Inventor 李雨陈晨陈玲瑀宋岩威
Owner 南京三聚生物质新材料科技有限公司
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