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A kind of detection method of trace cadmium and lead

A detection method and trace technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of high detection cost and insufficient sensitivity, and achieve the effects of large adsorption capacity, simplified separation time, and reduced use cost.

Active Publication Date: 2017-06-13
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The detection cost of graphite furnace atomic absorption method is relatively high, while flame atomic absorption method is fast and simple, but the sensitivity is not high enough

Method used

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  • A kind of detection method of trace cadmium and lead

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Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the mensuration of cadmium and lead in tealeaves

[0021] 1. Sample treatment: crush the dried tea leaves, pass through a 1 mm sieve, accurately weigh 0.1g (accurate to 0.0001 g), add 2mol L -1 Put 10mL of nitric acid into an ultrasonic bath, ultrasonicate at 40°C for 15min, centrifuge at 2000r / min for 10min, take the supernatant, dilute to 10mL with distilled water, set aside, and do reagent blank determination at the same time;

[0022] 2. Preparation of ferroferromagnetic nanomaterials: 2mol / L FeCl 3 ·7H 2 O 12mL and 1mol / L FeCl 2 4H 2 O 12mL was mixed with 120mL deionized water, and under the protection of nitrogen, 50mL ammonia water was added dropwise to make the pH of the solution system 9, heated in a water bath at 60°C, with a stirring speed of 400 rpm, and stirred at constant temperature for 3 hours, then washed with deionized water To neutrality, vacuum drying at 70°C for 8 hours to prepare ferroferromagnetic nanomaterials;

[0023] 3. Add ...

Embodiment 2

[0024] Embodiment 2: the mensuration of cadmium and lead in feed

[0025] 1. Sample treatment: crush the feed sample, pass it through a 1 mm sieve, weigh about 0.1 g (accurate to 0.0001 g), add 6mol L -1 Put 10mL of nitric acid into an ultrasonic bath, ultrasonicate at 40°C for 15min, centrifuge at 2000r / min for 10min, take the supernatant, dilute to 10mL with distilled water, set aside, and do reagent blank determination at the same time;

[0026] 2. Preparation of ferroferromagnetic nanomaterials: 2mol / L FeCl 3 ·7H 2 O 12mL with 1mol / LFeSO 4 ·7H 2 O 15mL was mixed with 150mL deionized water, under the protection of nitrogen, 50mL ammonia water was added dropwise to make the pH of the solution system 10, heated in a water bath at 70°C, with a stirring speed of 600 rpm, and stirred at a constant temperature for 1.5h, then deionized water Wash until neutral, and dry in vacuum at 40°C for 12 hours to prepare ferroferric oxide magnetic nanomaterials;

[0027] 3. In the 10mL ...

Embodiment 3

[0028] Embodiment 3: the mensuration of cadmium and lead in Chinese cabbage

[0029] 1. Sample treatment: Wash, dry, crush the cabbage sample, pass through a 1 mm sieve, accurately weigh 2.5000g of the sample into a microwave digestion tank, and add the digestion reagent HNO 3 -H 2 o 2(5:1, V / V) 12.5mL, put into airtight microwave digestion system, adjust temperature 180 ℃ and heat up 10min, and keep the temperature at this temperature for 15min, microwave output power 1000w; Put the digestion solution in a polytetrafluoroethylene beaker, heat it on an adjustable electric heating plate to catch the acid for 30 minutes, then dilute it to 10 mL with distilled water, set it aside, and do reagent blank determination at the same time;

[0030] 2. Add 2mol / L Fe 2 (SO 4 ) 3 9H 2 O 10mL and 1mol / L FeSO 4 ·7H 2 O 12mL was mixed with 150mL deionized water, and under the protection of nitrogen, 50mL ammonia water was added dropwise to make the pH of the solution system 11, heated...

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Abstract

The invention discloses a method for detecting trace cadmium and lead, and belongs to the technical field of food safety detection. In the provided detection method, the complex formed by the cadmium / lead and ammonium pyrrolidinedithiocarbamate (APDC) can be evenly dispersed in a solution containing surfactants, the Fe3O4 nano particles are utilized to carry out dispersed solid-phase micro-extraction under the assistance of magnetic field separation, then an eluent is used to carry out elution, and an atomic adsorption spectrometry method is adopted to measure the trace cadmium and lead. The provided method can be used to measure the trace cadmium and lead in agricultural products, has the characteristics of high detection sensitivity, short time, and little using amount of organic solvent, and is capable of achieving sensitive, rapid, and convenient detection on the trace lead and cadmium in agriculture and sideline products.

Description

technical field [0001] The invention relates to a detection method for trace amounts of cadmium and lead, belonging to the technical field of food safety detection. Background technique [0002] Heavy metal elements will have an impact on the ecological environment and human health. Heavy metals generally exist in nature in natural concentrations, but due to the increasing mining, smelting, processing and commodity manufacturing activities of heavy metals, many heavy metals such as lead, cadmium, cobalt, etc. enter the atmosphere, water and soil, causing severe Therefore, it is becoming increasingly important to accurately detect heavy metal elements in environmental samples. The heavy metal lead (Pb) is an important heavy metal element. It and its compounds are toxic to various tissues of the human body. The harm of lead poisoning is mainly manifested in lifelong damage to the nervous system, blood system, cardiovascular system, and skeletal system. superior. Because lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31
Inventor 杨亚玲焦扬
Owner KUNMING UNIV OF SCI & TECH
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