Call for discussion topics for this edition (prizes available)
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In response to the suggestions and requests of the HaiChuan management team, we are now seeking topics for discussions in this edition. It has not yet been decided whether discussions will take place on a weekly basis or on a daily basis; we look forward to your suggestions. If you want to get the work done ahead of time, it is recommended that you explain the topics you suggested in your reply, along with details such as what problem they are meant to solve and what objectives they aim to achieve. You can also send the topics you think are good via in-site messaging to moderator Canghai, or you can send them to me as well. Everyone is welcome to come up with questions. This post was last edited by Canghai Yili Sha on 2009-2-18 at 16:18.]
Regarding the accuracy of COD testing in high-salinity water, this is something I am eager to know. There are also the chemical analysis and testing methods for sodium formate. I’m not sure if anyone is interested, so let’s discuss more.
On the process of producing urea by carbon dioxide stripping
If the standard has not yet been finalized but the product’s protection period has expired, can it be replicated using provisional standards? For example, can research on related substances be carried out by referring to provisional standards? As follows: Regulations on the Administration of Drug Registration (Provisional), No. 35, Article 87: **The Drug Administration and the drug administration agencies of provinces, autonomous regions, and municipalities directly under the Central Government will not accept applications for drug registration based on provisional standards when a formal standard already exists.** I believe that process and quality research can be carried out, but whether it is possible to submit an application may depend on formal standards and new registration regulations. The existing standards should be appropriately expanded during the research by adding some necessary elements. (I hope to get an answer from experts.)
China’s coal chemical industry has seen rapid development in recent years. As analysts working in this industry, we pay close attention to the latest advancements in analysis techniques and instruments related to coal chemical processing, such as coal quality analysis and elemental analysis of coal
Special topics are discussed for the problems that may arise during the operation of various analytical instruments, such as GC, HPLC, spectrophotometers, and Karl Fischer titrators.
The use of measurement uncertainty to quantitatively assess the quality of measurement results is a hot topic in current measurement practices. Therefore, I would like to raise the following question: Should measurement uncertainty be applied in corporate quality inspection work? How should it be used, or in what areas can it be applied?
1. By observing the number of posts, I noticed that not many people stay on the forum every day. Discussing one topic once a day definitely isn’t sufficient – the time frame is too short; discussing it on a weekly basis would work better. It’s recommended not to lock the post; instead, add some summaries of the discussions under the topic after a week； If anyone has new insights in the future, they can write them down. 2. For forum members working on different sections, the division of tasks is complex. Although they are all engaged in analysis, this field is extremely broad; it’s better to choose topics that align with the main categories related to various processes discussed on the forum, as this will lead to more lively and in-depth discussions. 3. You can select a theme through an open selection process, and as soon as the theme is chosen, the discussion is likely to begin. 4. Organize a support group. Once a topic is set, problems need to be solved; it’s likely necessary to contact some experts in advance, so that they can participate in the discussions and answer questions. That’s all for now!
Common problems in analyzing NPK in compound fertilizers and control measures
I think it’s better to have one question per week; I suggest that everyone check the answers first before posting them. Don’t have multiple answers to one question, with different meanings each.
Discuss the methods for carbon and sulfur analysis in ferroalloys and the selection of equipment.
In ammonia synthesis production, there is a decarburization step. The commonly used wet decarburization processes today include carbon propylene, NHD, MDEA, and thermal potassium alkali. The comprehensive analysis of these solutions is very complicated; it is recommended that the analysis methods for decarburization solutions be discussed as a topic for everyone to exchange ideas and improve their skills.
It is suggested that laboratory safety cannot be ignored; we hope that colleagues will share and discuss their experiences in managing laboratory safety. One can also share their own lessons for others to learn from
One more thing: could we discuss the considerations and experiences related to laboratory certification and accreditation, on-site audits, and qualification certifications? It seems there aren’t many posts on this topic.
What is the tensile speed specified by the American ASTM testing standards for measuring the elongation at break of rubber test pieces? Is there a difference from the 500 mm/min specified by Chinese standards? According to the standards, the stretching speed for dumbbell-shaped specimens under the national standard GB/T528 is 500 mm/min ； The ASTM D412 standard specifies a tensile speed of 20 ±2 in/min for the dumbbell-shaped specimens, which converts to 508 mm/min after unit conversion. Actually, there is no difference in the stretching speed. Furthermore, there is no difference in tensile strength (under the same material and sample preparation conditions, etc.); elongation and stress at a fixed strain depend on the initial gauge length during stretching, as only when the initial gauge lengths are the same can these two parameters be compared. But I always feel there’s something unreasonable about it; I would appreciate it if experts could provide a sound answer.
RT, has anyone encountered this situation? The sample in question is likely chromium oxide or chromium hydroxide, with a small amount of organic substances acting as dispersants. The amount of sample used for testing is sufficient; the person in charge of the testing said that there’s definitely no issue with the equipment as well, which is confusing. . . Was this situation not present when working with samples of other elements before? Is this related to the scale of the sample? The particle size of the sample is relatively small, and it is an amorphous material; please discuss this.
I think one question per week is too little, while one question per day is too much. Three questions per week is appropriate. I am currently learning to use atomic absorption spectroscopy, and I would like to understand how to develop appropriate analysis procedures for different samples in order to detect metal impurities.
It’s better to have one question per week, along with one discussion per week. This way, those who don’t come often (mainly those friends in Sichuan who have difficulty accessing the internet) can also participate, engage in more discussions, think more, express their opinions, and share ideas together. I think when analyzing this section, it might be possible to allocate a part of it to quality inspection, or to discuss more issues related to quality. It seems that there are many questions regarding quality, but few people who can answer them.