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Lead and cadmium determination method for fruit of ficus carica linn.

A determination method and fig technology, applied in the field of heavy metal detection, can solve the problems of high equipment requirements, high operation and maintenance costs, and limited detection sensitivity of the detection method, and achieve the effects of automatic sampling, simplified operation, and high sensitivity

Active Publication Date: 2015-11-04
菏泽天蓝果蔬专业合作社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main analysis methods include atomic absorption spectrophotometer, atomic fluorescence spectrometry, inductively coupled plasma emission spectrometry, inductively coupled plasma mass spectrometry, etc., but are generally limited by expensive instruments and high operation and maintenance costs. However, the penetration rate is low, and there are still defects such as limited detection sensitivity, high equipment requirements for detection methods, and the inability to detect and analyze multiple heavy metals at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Pretreatment of actual samples

[0034] (1) Food samples

[0035] Take 1g of dried fig sample, the variety is Branschweig, put it into a beaker, add 15ml of pure nitric acid, and digest it with microwave at a temperature of 200°C. For digestion, the sample is passed through a filter membrane with a pore size of 0.45 microns. After filtering, dilute to 50ml (adjust the pH to 7) for the analysis of cadmium and lead.

[0036] (2) Lead and cadmium are generally determined by the graphite furnace method, which can only be measured on the order of nanograms, but the operation is complicated, easily disturbed, and affected by the amount of sample injected, the error is relatively large.

[0037] New method: get test solution (15 milliliters) and comprise test sample, cadmium standard substance or lead standard substance, above-mentioned solution all contains diphenylthiocarbazone (4.5mg / L), these test solution pHs are 7, add Glass screw cap conical bottom centrifuge tube...

Embodiment 2

[0040] 1. Pretreatment of actual samples

[0041] (1) Food samples

[0042] Take 1g of dried fig sample, the variety is Jinzao, put it into a beaker, add 15ml of pure nitric acid, and digest it with microwave at a temperature of 200°C. For digestion, the sample is passed through a filter membrane with a pore size of 0.45 microns. After filtering, dilute to 50ml (adjust the pH to 7) for the analysis of cadmium and lead.

[0043] (2) Lead and cadmium are generally determined by the graphite furnace method, which can only be measured on the order of nanograms, but the operation is complicated, easily disturbed, and affected by the amount of sample injected, the error is relatively large.

[0044] New method: get test solution (20 milliliters) and comprise test sample, cadmium standard substance or lead standard substance, above-mentioned solution all contains diphenylthiocarbazone (4.5mg / L), these test solution pHs are 7, add Glass screw cap conical bottom centrifuge tubes. T...

Embodiment 3

[0047]1. Pretreatment of actual samples

[0048] (1) Food samples

[0049] Take 1.5g of dry sample, put it into a beaker, add 15ml of pure nitric acid, microwave digestion, the temperature is 200°C. For digestion, the sample is passed through a filter membrane with a pore size of 0.45 microns. After filtering, dilute to 50ml (adjust the pH to 7) for the analysis of cadmium and lead.

[0050] (2) Lead and cadmium are generally determined by the graphite furnace method, which can only be measured on the order of nanograms, but the operation is complicated, easily disturbed, and affected by the amount of sample injected, the error is relatively large.

[0051] New method: get test solution (18 milliliters) and comprise test sample, cadmium standard substance or lead standard substance, above-mentioned solution all contains diphenylthiocarbazone (4.5mg / L), these test solution pHs are 7, add Glass screw cap conical bottom centrifuge tubes. Then, a methanol solution ((w / v)) cont...

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Abstract

The invention discloses a lead and cadmium determination method for a fruit of ficus carica linn.. The method is characterized by comprising the following steps that (1) a dry ficus carica linn. sample is collected to be dissolved in nitric acid, microwave digestion is conducted at the temperature of 200 DEG C, filtering and diluting are carried out after digestive treatment is completed, and accordingly a sample to be tested is obtained; (2) diphenylthiocarbazone is added in the sample to be tested, a cadmium standard substance and / or a lead standard substance, the pH value is adjusted to be 6.8-7.2, then a methanol solution of benzophenone is added for centrifugal separation, an organic phase is collected, an extraction agent is added to be evenly mixed, an atomic absorption spectrophotometer flame absorption method is used for determining the absorbance values of the solution to be tested, the cadmium standard substance and / or the lead standard substance; (3) a lead calibration curve and a cadmium calibration curve are drawn, and therefore the content of lead and cadmium in the dry ficus carica linn. sample is acquired.

Description

technical field [0001] The invention relates to the field of heavy metal detection. In particular, it relates to a method for determining lead and cadmium in fig fruit. Background technique [0002] Fig (Ficus carica Linn.) is a flowering plant belonging to the genus Moraceae. It mainly grows in some tropical and temperate regions and is a subtropical deciduous small tree. There are currently 800 known varieties of figs, most of which are evergreen varieties, and only those that grow in temperate regions are deciduous varieties. The fruit is bulbous with a small hole in the tail, and the pollen is spread by wasps. Because of its good medicinal value, it is more and more popular. [0003] However, the hazards of heavy metal elements in the environment are increasingly recognized by the whole society. Due to soil and water pollution, incidents of excessive lead and cadmium content in crops emerge in endlessly. Since lead and cadmium are the most harmful, the detection of le...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 孙锐
Owner 菏泽天蓝果蔬专业合作社
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