NY/T 838-2004
ActiveTest method of Fluorine in tea - Electrode method for selection of Fluorine ion
茶叶中氟含量测定方法 氟离子选择电极法
Catalogue
前言 → 1 范围 → 2 规范性引用文件 → 3 方法提要 → 4 试剂和溶液 → 5 仪器 Foreword → 1 Scope → 2 Normative References → 3 Method Summary → 4 Reagents and Solutions → 5 Instruments
Scope
This standard specifies the test method for the determination of fluorine content in tea. This standard is applicable to the determination of fluorine content in tea.
本标准规定了茶叶中氟含量测定的试验方法。本标准适用于茶叶中氟含量的测定。
Normative References
Keywords
Application Summary AI generated
Tea producers and testing laboratories use this standard to determine the fluorine content in tea. Using the fluoride ion selective electrode method, it accurately assesses fluorine levels to ensure tea quality and safety. This standard is important for controlling fluorine intake from tea and protecting consumer health.
茶叶生产企业和检测机构使用本标准来测定茶叶中的氟含量。通过氟离子选择电极法，可以准确评估茶叶中氟的水平，确保茶叶质量安全。该标准对控制茶叶中氟的摄入量、保护消费者健康具有重要意义。
AI Summary AI generated
This standard specifies a method for determining fluorine content in tea using a fluoride ion selective electrode. It is based on the selective response of a lanthanum fluoride membrane to fluoride ions, measuring potential differences to calculate ion activity. Applicable for accurate fluorine determination in tea, it covers reagent preparation, instrument use, and procedures. It references GB/T 603, GB/T 6682, and GB/T 8302 to ensure standardization and reliability.
本标准规定了茶叶中氟含量的测定方法，采用氟离子选择电极法。方法基于氟化镧单晶膜对氟离子的选择性响应，通过测量电位差计算氟离子活度。适用于茶叶中氟含量的准确测定，涉及试剂配制、仪器使用和操作步骤。标准引用GB/T 603、GB/T 6682和GB/T 8302，确保试验的规范性和可靠性。
Key Sentences extracted from text
本标准规定了茶叶中氟含量测定的试验方法。
氟离子选择电极的氟化镧单晶膜对氟离子产生选择性的响应。
在氟电极和饱和甘汞电极的电极对中，电位差可随溶液中氟离子活度的变化而改变。
工作电池可表示如下: Ag|AgCl,Cl(0.3 mol/L),F(0.001 mol/L)|LaF3|试液||外参比电极。
所有试剂除另有说明外，均按GB/T 603和GB/T 6682之规定制备。
This standard specifies the test method for the determination of fluorine content in tea.
The lanthanum fluoride single crystal membrane of the fluoride ion selective electrode produces a selective response to fluoride ions.
In the electrode pair of fluoride electrode and saturated calomel electrode, the potential difference can change with the change of fluoride ion activity in the solution.
The working battery can be expressed as follows: Ag|AgCl,Cl(0.3 mol/L),F(0.001 mol/L)|LaF3|test solution||external reference electrode.
All reagents, unless otherwise specified, shall be prepared according to the provisions of GB/T 603 and GB/T 6682.