1. accuracy： Analyze the degree of agreement between the detected value and the true value or acceptable reference value. It can be expressed as a percentage of analytical reference standard samples or quality control samples. 2. precision： The degree of coincidence between the detected values is the repeated analysis and detection of samples. It can be expressed by calculating the relative standard deviation (RSD) of repeated test values of the sample or by calculating the relative difference (Relative percent difference, RPD) of the two repeated analysis values. 3.matrix： The main ..read more

Inadequate inductively coupled plasma (ICP) sample preparation or improper configuration of the sample introduction system can have negative effects such as signal drift, increased background, insufficient detection limits, or unexpected interferences. This article will focus on the key steps required to create a sample preparation workflow for elemental analysis. ICP-MS is mainly used to analyze liquid samples. In most cases, the sample must (if possible) be dissolved in a suitable diluent. While aqueous diluents such as ultrapure water or dilute acids are generally easier to handle ..read more

The chemical composition of food is very complex. It not only contains macromolecular organic compounds such as protein, sugar, fat, vitamins, and organic pesticides introduced due to pollution, but also contains various inorganic elements such as potassium, sodium, calcium, and iron. These components often exist in a complex bonded or complexed state through various forces. When a method is used to determine the content of a certain component, the presence of other components often interferes with the determination. Therefore, sample pretreatment often determines the success or failure of th ..read more

Food safety testing is an issue that everyone is concerned about, and the pretreatment of food samples is a key step that affects the test results. This article sorts out several sample pretreatment methods in food testing, hoping to help inspectors engaged in food testing. Sample pretreatment: the process of sample preparation and extraction, purification and concentration of the components to be measured in the sample. In the detection and analysis of the whole food safety, 70% to 80% or even more time is spent on the pretreatment of the sample, and more than 60% of the errors brought to the ..read more

ICP-OES is a very important instrumentation in our laboratory, the principle of ICP-OES, application areas, pre-treatment and common problems, take a quick look. Inductively coupled plasma atomic emission spectrometry (ICP-OES), a spectroscopic analysis method using inductively coupled plasma moment as the excitation light source, has the advantages of high accuracy and precision, low detection limit, rapid determination, wide linear range, and simultaneous determination of multiple elements, etc. It has been widely used for the determination of dozens of elements in environmental samples and ..read more

Ed McCurdy is an Agilent ICP-MS Applications Engineer; article from Spectroscopy Magazine, Vol. 37, No. 2. Inductively coupled plasma tandem mass spectrometry (ICP-MS/MS) is a relatively new technology, with the world's first ICP-MS/MS (Agilent 8800) being commercially available in 2012. However, the technology is rapidly gaining acceptance and is used in a variety of industries including industrial manufacturing, third party testing, government, research and universities. In this article we will explain the key steps in the development of an ICP-MS/MS method and clarify some common misconcept ..read more

The burette, a titration instrument commonly used in analytical chemistry, can only be used for acidic solutions. It can be used for acid-base neutralization titration test, etc. 1. The burette is divided into acid burette and basic burette Acid Burette -------- PTFE Piston ----- Measure or titrate acid solution or oxidizing reagent. 2. The upper part of the scale is small (with 0 scale), and the lower part is large. 3. The minimum scale is 0.1ml, and the accuracy is one percent. Accurate to 0.01ml. 4. The liquid in the lower tip is not within the scale, and the liquid in the tip cannot be rel ..read more

Determination of Alkyl Mercury in Water: Purge and Trap/Gas Chromatography-Cold Atomic Fluorescence Spectrometry Distillation-ethylation Determination of Methmercury in Natural Water by GC-CVAFS Sample distillation of alkylmercury in the sample to be tested (water quality) is used as a pretreatment method for the determination of alkylmercury in water quality in "HJ 977-2018", different from "GB/T 14204-93" and "GB/T 17132-1997" "mercapto cotton enrichment - hydrochloric acid sodium chloride solution desorption - toluene extraction", the purpose of distillation is to remove the interference of ..read more

Polytetrafluoroethylene (PTFE) square plate is also called tray: high temperature resistance and corrosion resistance. Various specifications and shapes of PTFE square plates can be customized. It is used in film forming experiments, sample liquid leakage, etc. Features: 1. The appearance is pure white. 2. High and low temperature resistance: the usable temperature is -200℃～+250℃. 3. Corrosion resistance: resistant to strong acid, strong alkali, aqua regia and various organic solvents, and has no dissolution, adsorption and precipitation. 4. Anti-pollution: the metal element blank value is l ..read more

Impingers are small bottles used with an air sample pump to collect airborne hazards into designated collection liquids for analysis. For personal exposure measurement the impinger mounts in a holster accessory near the breathing zone. For area monitoring the impinger is mounted on the side of a pump with a holder accessory. Binglab offers impingers in PFA(fluoropolymer) to meet your applications. Unbreakable 15ml30ml60ml PFA impingers are an ideal alternative to glass impingers. PFA impingers are safe to use and are inert to virtually all chemicals and perform well in high-temperature a ..read more