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Anonymous users2024-02-08Mission description. After the completion of the test and manual infiltration, according to the original records, in accordance with the prescribed format, carefully issue the inspection report. Through the study of this task, students will learn to fill in the inspection report, summarize the project task, and evaluate the attitude, ability, participation, problem-solving ability, and ability to cooperate with classmates in the process of completing the project task, which is divided into student self-evaluation, mutual evaluation and teacher evaluation.
Task implementation. 1. Fill in the inspection report.
According to the gold content in the gold ore in task 2 and the silver content in the ore in task 3, the gold ore sample inspection report is issued; According to the palladium content in the acid leaching solution in task 4, a palladium test report of the acid leaching solution sample is issued. The format of the report is provided in appendix I**10.
2. Task evaluation.
On the basis of completing the above teaching links, summarize the task, and evaluate the students' attitude, ability, participation, problem-solving ability, and ability to cooperate with classmates in the process of completing the task, which can also be carried out after each task. It is divided into student self-evaluation, peer evaluation and teacher evaluation. In Appendix II, **1 4 is the task evaluation form, and **5 6 is the evaluation reference standard.
20899-2007, Methods for Chemical Analysis of Gold Ore Huai Potato Hail Part I: Determination of Gold and Silver Amount.
Practice and think.
1.What are the enrichment methods?
2.What are the main methods for determining gold? What are the advantages and disadvantages of each?
3.What should I pay attention to when sampling ore?
4.What are the main methods of sample decomposition of ore? What are the advantages and disadvantages of each?
After combining with Cl-, it forms a white gelatinous precipitate, and in the process of silver determination, why can the sample be decomposed with hydrochloric acid when the sample is decomposed?
6.In what form does gold exist in nature? There is AU in aqueous solution
Are compounds present?
7.Describe the workflow of lead assay.
8.Weigh a silver-containing sample, add an appropriate amount of nitric acid, and use ammonium iron as the indicator agent, and consume NH4
SCN solution (Calculate the mass fraction of silver in this sample.)
9.The sample containing gold was weighed, separated and enriched with polyvinyl chloride-nylon 6 resin after treatment, excess potassium iodide was added to the eluent to reduce gold, and the iodine was consumed when titrated with sodium thiosulfate standard dissolved lead sail solution ( ), and used to titrate the blank, and the gold content in the sample was calculated.
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Anonymous users2024-02-07Use atomic absorption light dispersion spectrum, and the testing agency will worry about the specific test method.
This method is more troublesome, but also a special palladium lamp, but also a standard palladium solution, but also to detect the early call mechanism for detection, your sample is damaged, and the most expensive, but the accuracy is quite high, it is definitely a good way to quantitatively determine the content of metal elements.
If it's ring jewelry or something, I think you should have a special jewelry appraisal agency in your local area, so look for them......
That's all I can say, and I hope it helps you.
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Anonymous users2024-02-06ICP-OES method for university laboratories.
It is an inductively coupled plasma radiometer.
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Anonymous users2024-02-05Hello! ICP-OES method for university laboratories.
It is a trap shed instrument that should be coupled with plasma radiation spectroscopy.
Are you still satisfied with my Wang Ze?
You can check the emission standards first, and then there are metal ion detection methods, and then you are looking up the specific steps.
The plant weighs 2g 5g sample (accurate to g, according to the content of lead and cadmium), cuts it, puts it in a porcelain crucible, first carbonizes it on an adjustable electric heating plate over low heat until it is smokeless, moves it into the muffle furnace 500 25 ash for 1h, cools, dissolves the ash with mol l nitric acid, washes the sample digest into (without filtration) 100 ml volumetric flask with a dropper, washes the porcelain crucible with a small amount of water for many times, and the lotion is combined in the volumetric flask and fixed to the scale, mixed well and set aside. >>>More
Of course, the following methods are to measure the original mass in the sample, and then fully heat it to see how much the mass is reduced, and what is reduced is the H2O and CO2 released in 2NaHCO3=Na2CO3+H2O+CO2, so that the mass of NaHCO3 in it is known, and finally of course it must be converted into the original sample mass.
Because grinding can make copper sulfate with crystalline water. >>>More
Method for determining carbon black in soil: The structure of carbon black is expressed by the degree to which carbon black particles aggregate into chains or grapes. Carbon black, which is composed of a condensate consisting of the size and shape of the conglomerate and the number of particles in each condensate, is called high-structure carbon black. >>>More