Supercharge Your Innovation With Domain-Expert AI Agents!

Measuring method of heavy metal Pb waste water

A determination method and technology for heavy metals, applied in the field of analytical chemistry, can solve problems such as harm to human health, inability to discharge, poisoning of aquatic products, etc., and achieve the effect of strong operability and low cost

Inactive Publication Date: 2017-01-18
防城港市质量技术监督局
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Heavy metal enrichment exists in aquatic products, which will poison aquatic organisms, and then accumulate in the human body and cannot be excreted, endangering human health

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of assay method of heavy metal Pb in waste water, comprises the following steps:

[0020] (1) make Pb standard solution curve;

[0021] (2) Take 100 mL of wastewater sample and put it into a beaker, add 5 mL of concentrated nitric acid, and heat and digest on the electric heating plate; the conditions for heating and digestion on the electric heating plate are: temperature 160 ° C, time 120 min;

[0022] (3) When the water sample is steamed to 85mL, add 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continue to heat and digest on the electric heating plate;

[0023] (4) When the water sample is evaporated to the remaining 70mL, take it down and cool it down. After cooling, add 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl, put it into a colorimetric tube, and set the volume to 100mL. If the solution is cloudy, Then filter and then measure;

[0024] (5) Measure and record the data results by atomic absorption spectrometry, substitute the measu...

Embodiment 2

[0026] A kind of assay method of heavy metal Pb in waste water, comprises the following steps:

[0027] (1) make Pb standard solution curve;

[0028] (2) Take 100mL of wastewater sample and put it into a beaker, add 5mL of concentrated nitric acid, and heat and digest on the electric heating plate; the conditions for heating and digestion on the electric heating plate are: temperature 180°C, time 180min;

[0029] (3) When the water sample is steamed to 85mL, add 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continue to heat and digest on the electric heating plate;

[0030] (4) When the water sample is evaporated to the remaining 70mL, take it down and cool it down. After cooling, add 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl, put it into a colorimetric tube, and set the volume to 100mL. If the solution is cloudy, Then filter and then measure;

[0031] (5) Measure and record the data results by atomic absorption spectrometry, substitute the measuremen...

Embodiment 3

[0033] A kind of assay method of heavy metal Pb in waste water, comprises the following steps:

[0034] (1) make Pb standard solution curve;

[0035] (2) Take 100mL of wastewater sample and put it into a beaker, add 5mL of concentrated nitric acid, and heat and digest on the electric heating plate; the conditions for heating and digestion on the electric heating plate are: temperature 165°C, time 150min;

[0036] (3) When the water sample is steamed to 85mL, add 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continue to heat and digest on the electric heating plate;

[0037] (4) When the water sample is evaporated to the remaining 70mL, take it down and cool it down. After cooling, add 2mL of 10% ammonium chloride and 10mL of 3mol / L HCl, put it into a colorimetric tube, and set the volume to 100mL. If the solution is cloudy, Then filter and then measure;

[0038] (5) Measure and record the data results by atomic absorption spectrometry, substitute the measuremen...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of analytical chemistry, and particularly relates to a measuring method of heavy metal Pb in waste water. The measuring method of heavy metal Pb waste water comprises the following steps of 1, making a Pb standard solution curve; 2, selecting 100mL waste water sample and putting into a beaker, adding 5mL concentrated nitric acid, and heating and digesting on an electric hot plate; 3, when the water sample is distilled to 85mL, adding 5mL concentrated nitric acid and 2mL hydrogen peroxide, and continuing heating and digesting on the electric hot plate; 4, when the water sample is distilled to 70mL left, taking down for cooling, adding 2mL 10% ammonium chloride and 10mL 3mol / L HCl after cooling, putting the added ammonium chloride and HCl into a colorimetric tube, conducting constant volume to 100mL, if the solution is relatively turbid, filtering firstly and then measuring; 5, measuring with atomic absorption spectroscopy and recording a data result, substituting the measured result into the Pb standard solution curve, and calculating, so that the content of heavy metal Pb in waste water is obtained. The measuring method of heavy metal Pb waste water can accurately test the content of Pb; and the method has strong operability in and low cost.

Description

technical field [0001] The invention belongs to the field of analytical chemistry, in particular to a method for determining heavy metal Pb in waste water. Background technique [0002] Heavy metals refer to metals with a density above 5×103kg / m3, such as gold (Au), silver (Ag), mercury (Hg), copper (Cu), lead (Pb), cadmium (Cd), chromium (Cr), etc. . Some heavy metals enter the human body through food, interfere with the normal physiological functions of the human body, and endanger human health. They are called toxic heavy metals, mainly mercury, cadmium, chromium (Cr), lead, arsenic (As), zinc (Zn), tin (Sn) Wait. Among them, arsenic is originally a non-metallic element, but according to its chemical properties and in view of its toxicity, it is generally listed as a toxic heavy metal element. Human activities can easily cause heavy metal pollution in water quality. By eating aquatic products, people accumulate heavy metals in the human body and seriously damage their...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 苏运胜
Owner 防城港市质量技术监督局
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com