echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Chemicals Industry > Chemical Technology > Selection of food physical and chemical testing instruments, reagents and experimental water

    Selection of food physical and chemical testing instruments, reagents and experimental water

    • Last Update: 2021-09-16
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com

    (1) Choice of instrument

    The performance and measurement sensitivity of the instrument can directly affect the quality of the test results


    (2) Choice of chemical reagents

    The quality of reagents directly affects the quality of testing.


    Commonly used chemical reagents for physical and chemical testing include general reagents, reference reagents, high-purity reagents and special reagents


    In China's national standards, general reagents are divided into 3 grades, as shown in Table 1-1


    The purity of the reference reagent is equal to or higher than that of the superior grade, which can be used to directly prepare or calibrate the standard solution


    Table 1-1 Specifications and signs of chemical reagents


    High purity reagents are reagents whose purity is much higher than that of superior grade


    Special reagents refer to reagents with special purposes


    The prices of different grades or categories of reagents vary greatly, so you should pay attention to saving when choosing them


    (3) Selection of experimental water

    Water is the most commonly used solvent


    Table 1-2 Analytical laboratory water specifications (GB/T6682-2008)


    The first grade water is used for micro and ultra micro analysis tests with strict requirements, such as water for high performance liquid chromatography


    Tertiary water can be prepared by distillation or ion exchange methods


     

     

    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.