There is increasing evidence that bisphenol A (BPA)-used in plastics, receipts, food packaging, and other products-might be harmful to human health due to its actions as an endocrine-disrupting chemical (EDC) Scientists, regulators, and the general public have raised concerns about the use of BPA, especially because of its ubiquitous nature and potential for continuous exposure. This has prompted industry to seek alternative chemicals. As manufacturers have begun to remove BPA from their products as a result of consumer concern, there has been a gradual shift to using bisphenol analogs. For the purpose of our review, we chose to evaluate two of these analogs-Bisphenol S (BPS) and bisphenol F (BPF)-because of their widespread consumer and commercial use. BPS is used for a variety of industrial applications, for example, as a wash fastening agent in cleaning products, an electroplating solvent, and a constituent of phenolic resin. BPS is also used as a developer in thermal paper, including products marketed as [BPA-free paper" . BPF is used to make epoxy resins and coatings, especially for systems needing increased thickness and durability (i.e., high-solid/high-build systems), such as tank and pipe linings, industrial floors, road and bridge deck toppings, structural adhesives, grouts, coatings, and electrical varnishes. BPF epoxy resins are also used for several consumer products such as lacquers, varnishes, liners, adhesives, plastics, water pipes, dental sealants, and food packaging. Plating Solution Additive,Supply Plating Solution Additive,High Quality Plating Solution Additive ,Powder High Purity Body Building Jiangxi Hongjiu New Material Technology Co.,Ltd. , https://www.hongjiutech.com
1. Definition Conductivity meter is an instrument suitable for precise measurement of various liquid media. It is mainly used to accurately measure the conductivity value of liquid media. When equipped with a constant electrode, it can accurately measure the conductivity of high-pure water. It is widely used in various fields. Scientific research and production.
2. Usage and Characteristics Conductivity meter is a laboratory conductivity meter. It can not only measure the conductivity of general liquid, but also meet the need of measuring the conductivity of high purity water. The instrument has a 0~10mV signal output, which can be connected to an automatic electronic potentiometer for continuous recording. The conductivity meter is a necessary inspection equipment for QS and HACCP certification of food factories and drinking water plants.
3, the working principle Conductivity is a digital representation of the ability of the solution conduction current. The conductivity of water has a certain relationship with the amount of inorganic acids, alkalis and salts it contains. When their concentrations are low, the conductivity increases with the increase of concentration. Therefore, this indicator is often used to estimate the total amount of ions in water. Concentration or salt content.
The conductance (G) is the reciprocal of the resistance (R). Therefore, when two electrodes (usually platinum electrodes or platinum black electrodes) are inserted into the solution, the resistance R between the two electrodes can be measured. According to Ohm's law, when the temperature is constant, this resistance value is proportional to the electrode distance L (cm), which is inversely proportional to the cross-sectional area A (cm2) of the electrode, that is: R=Ï×(L/A) where Ï is the resistivity and is long 1cm, the resistance of the conductor with a cross-sectional area of ​​1cm2 depends on the nature of the material. According to the above equation, the conductance (G) of the conductor can be expressed as follows: G = 1/R = (1/Ï) × (A/L) = K × (1/J) where K = 1/Ï is Electrical conductivity, J=L/A, referred to as electrode constant Electrolyte conductivity refers to the conductance of a 1 cm3 solution between two parallel electrodes spaced 1 cm apart. From the above equation, when the electrode constant (J) is known and the solution resistance (R) or conductance (G) is measured, the conductivity can be determined.
Conductivity meters have been widely used in various laboratories and other measurement bases. For conductivity meter related knowledge from the basis of the beginning to make an introduction, help new users understand.