How to prepare a sample and what is the purpose of sample preparation

What are you going to prepare???

In general, sample preparation goes through the following four processes:

Collection: Collecting samples, including sample selection, collection, and preservation.

Preparation: Preparation of samples, including pre-return and processing of samples. Pretreatment includes sample crushing, dispersion and filtration; Processing includes chemical or physical changes in the sample, such as dissolution of the sample, extraction leakage, reactions, etc.

Analysis: Analysis of samples, including qualitative and quantitative analysis. Qualitative analysis is the process of determining the elements, compounds, or structures contained in a sample; Quantitative analysis is the determination of the amount of each element or compound in a sample.

Evaluation: Evaluation of the results of the analysis, including quality control and data processing. Quality control is the monitoring of the quality of the sample preparation and measurement process to ensure the accuracy and reliability of the analysis results; Data processing is the calculation, statistics, and interpretation of test data, and the final analysis results are obtained.

1. Provide a small amount of raw materials for a certain research, which can be provided by preparing samples.

2. New product research and development, through the preparation of sampling products, the sample analysis to determine whether it is the required product.

3. Through the sample preparation process, obtain various process parameters and equipment for preparation, so as to design the production line and enter the production of products.

The purpose of sample preparation can be several:

1) Provide a small amount of raw materials for a certain research, which can be provided by preparing samples.

2) In the research and development of new products, Pure Trust did not prepare samples and analyze the samples to determine whether they were the required products.

3) Through the sample preparation process, various process parameters and equipment of Tandong preparation are obtained, so as to design the production line for product production.

Hello, dear, the preparation process of fresh samples includes: , generally including crushing, screening, mixing, shrinking, drying and other processes. Workflow for Sample Collection & Preparation:

Prepare tools and sample bags; The sub-samples were collected from the container to be collected, and the sub-samples were merged into a total sample. The total sample is sent to the sample preparation room; The preparation of samples generally includes crushing, screening, mixing silver ballast, shrinking, drying and other processes; Talk about the prepared sample packaging identification, send the relevant information to the laboratory: the principle of sample collection and pulse should generally follow two principles: 1

The representativeness of the sample, since the population is inferred from the sample analysis, the sample collection should fully reflect the texture and composition of the population. 2.The physical, chemical, biological and other activities of the sample cannot be destroyed, and contamination cannot be introduced.

The purpose of sample preparation can be several:

1) Provide a small amount of raw materials for a certain research, which can be provided by preparing samples.

2) New product research and development, through the preparation of samples, the analysis of samples to determine whether it is the required product.

3) Through the sample preparation process, obtain various process parameters and equipment for preparation, so as to design the production line for product production.

Preparation of specimens.

1) Samples for the determination of fiber content, pH value of water immersion, and identification of plant residues. For the preparation of such samples, 200g of undisturbed samples can be separated from peat samples collected in the field and loaded into grinding flasks.

2) Samples for physical and chemical analysis. For the undisturbed peat sample after the determination of fiber content, water immersion pH value, and plant residue identification, if its mass exceeds about 1kg, about 1kg can be taken by the quartile method, and the remaining sample can be stored as a secondary sample.

The collected peat samples are torn apart, mixed and spread into squares, divided into four diagonal lines, and then two diagonal parts into one part, and if the resulting sample is still large, it can be processed again with a quarter method until the required number is reached.

The remaining peat samples are air-dried to avoid mould and alter properties. The peat sample is torn into pieces and spread on clean paper, spread into a thin layer, and placed in a cool and ventilated place indoors to dry (it can also be dried at <40), and turned frequently to speed up drying. Direct exposure to sunlight is strictly prohibited, and the invasion of acids, alkalis, steam, dust, etc. is prevented.

The sample for analysis, air-dried (can also be dried at <40, after the quality changes, crushed with a crusher, all through 60 mesh (, mixed and loaded into the grinding bottle, labeled with the sample number, for analysis.

If there are special analysis items, separate analysis samples should be prepared according to the requirements.

Preservation of samples.

In order to meet the needs of arbitration analysis and some scientific research work, a secondary sample should be retained during the sample preparation process, and the sample after the analysis should be temporarily retained for future reference. Because peat samples are susceptible to weathering, oxidation and deterioration, peat samples are generally not retained for a long time. Here's how to save it:

1) Put the peat sample into a white iron bucket, fill the bucket with nitrogen (expel the air), seal it with solder, and place it in a dry room without sunlight. This method allows for long-term storage of samples.

2) Put the sample into a double-layer plastic bag, and the air is discharged, sealed, and the bag mouth is put down into a wooden box, labeled, and stored in a dry, cool, and dark room.

3) In the process of shrinking, the secondary sample packed into the grinding bottle should be filled as much as possible to discharge the excess air, and then sealed with paraffin wax and stored in a dry and dark place.

4) After 3 months after the report is issued, the sample will be retained for one year, and then it can be processed and no longer saved.