News
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Development of chemical oxygen demand (COD) detection
Chemical oxygen demand is also called chemical oxygen demand (chemical oxygen demand), referred to as COD. It is the use of chemical oxidants (such as potassium permanganate) to oxidize and decompose oxidizable substances in water (such as organic matter, nitrite, ferrous salt, sulfide, etc.), an...Read more -
Determination of residual chlorine/total chlorine by DPD spectrophotometry
Chlorine disinfectant is a commonly used disinfectant and is widely used in the disinfection process of tap water, swimming pools, tableware, etc. However, chlorine-containing disinfectants will produce a variety of by-products during disinfection, so the safety of water quality after chlorinatio...Read more -
Introduction to DPD colorimetry
DPD spectrophotometry is the standard method for detecting free residual chlorine and total residual chlorine in China’s national standard “Water Quality Vocabulary and Analytical Methods” GB11898-89, jointly developed by the American Public Health Association, the American Wate...Read more -
The relationship between COD and BOD
Speaking of COD and BOD In professional terms COD stands for Chemical Oxygen Demand. Chemical Oxygen Demand is an important water quality pollution indicator, used to indicate the amount of reducing substances (mainly organic matter) in the water. The measurement of COD is calculated by using str...Read more -
Water quality COD determination method-rapid digestion spectrophotometry
The chemical oxygen demand (COD) measurement method, whether it is the reflux method, the rapid method or the photometric method, uses potassium dichromate as the oxidant, silver sulfate as the catalyst, and mercury sulfate as the masking agent for chloride ions. Under the acidic conditions of su...Read more -
How to make COD testing more accurate?
Control of COD analysis conditions in sewage treatment 1. Key factor—representativeness of the sample Since the water samples monitored in domestic sewage treatment are extremely uneven, the key to obtaining accurate COD monitoring results is that the sampling must be representative. To achie...Read more -
Turbidity in surface water
What is the turbidity? Turbidity refers to the degree of obstruction of a solution to the passage of light, which includes the scattering of light by suspended matter and the absorption of light by solute molecules. Turbidity is a parameter that describes the number of suspended particles in a li...Read more -
What is residual chlorine in water and how to detect it?
The concept of residual chlorine Residual chlorine is the amount of available chlorine remaining in the water after the water has been chlorinated and disinfected. This part of chlorine is added during the water treatment process to kill bacteria, microorganisms, organic matter and inorganic matt...Read more -
Lianhua Technology’s water quality analyzer shines with splendor at the IE Expo China 2024
Preface On April 18, the 25th China Environmental Expo opened grandly at the Shanghai New International Expo Center. As a domestic brand that has been deeply involved in the field of water quality testing for 42 years, Lianhua Technology made a wonderful appearance...Read more -
Fluorescence dissolved oxygen meter method and principle introduction
Fluorescence dissolved oxygen meter is an instrument used to measure the concentration of dissolved oxygen in water. Dissolved oxygen is one of the important parameters in water bodies. It has an important impact on the survival and reproduction of aquatic organisms. It is also one of the import...Read more -
UV oil meter method and principle introduction
The UV oil detector uses n-hexane as the extraction agent and complies with the requirements of the new national standard “HJ970-2018 Determination of Water Quality Petroleum by Ultraviolet Spectrophotometry”. working principle Under the condition of pH ≤ 2, the oil substances in the...Read more -
Infrared oil content analyzer method and principle introduction
The infrared oil meter is an instrument specially used to measure the oil content in water. It uses the principle of infrared spectroscopy to quantitatively analyze the oil in the water. It has the advantages of fast, accurate and convenient, and is widely used in water quality monitoring, envir...Read more
