Prior to the publication of HJ 1453—2026, the standardisation system for the determination of heavy metals in water in China was somewhat fragmented.[more]

China possesses the world’s largest reserves of rare earth elements; however, if these are not developed and utilised properly, they can pose significant risks to the environment, living organisms and human health. Rare earth elements and their compounds,[more]

Turbidity is a measure of the degree to which suspended particles in water obstruct the passage of light. Water turbidity is caused by suspended matter present in the water, such as silt, colloidal matter, organic matter, plankton and microorganisms. The[more]

For laboratory novices who are new to spectrophotometers, mastering standard operating procedures is essential. Incorrect operation not only affects data accuracy but may also damage the instrument. This article uses a common UV-Vis spectrophotometer as a[more]

Objective: This study aims to investigate the application of UV spectrophotometry based on different standards for determining the triterpene content in broken-cell-wall Ganoderma lucidum spore powder.[more]

A UV-visible spectrophotometric method was established for the determination of bismuth dinitrate in Chen Xiang Lu Bai Lu tablets. The detection wavelength was 326 nm, with dilute hydrochloric acid used as the extraction solvent, and ultrasonic extraction[more]

As living standards continue to rise, public concern over food safety is growing. A survey shows that 70% of the public consider 'food safety' as the top concern in daily health and safety.[more]

Geological laboratory testing provides vital support for geological research and plays a crucial role, particularly in the exploration and development of mineral resources. Atomic absorption spectroscopy, as an advanced technique for elemental analysis, h[more]

This method is applicable for the determination of chromium in cosmetics, with a minimum detection limit of 0.1 mg/kg.[more]

Copper alloys find extensive application across industrial sectors, particularly in the current high-speed rail construction where they are extensively utilised for circuit line construction. Consequently, the requirements for copper alloy usage within ci[more]

On 15 April 2012, CCTV's Weekly Quality Report programme, in its episode ‘Secrets Inside Capsules’, exposed certain enterprises in Hebei Province using quicklime to process leather waste into industrial gelatin.[more]

Following digestion, the sample is introduced into an atomic absorption spectrometer. Upon flame atomisation, potassium and sodium absorb at resonance lines of 766.5 nm and 589.0 nm respectively.[more]

Flame atomic absorption spectrophotometry is an analytical method based on the selective absorption of characteristic spectral lines by the ground-state atoms of a target element. When a sample is introduced into the flame, compounds of the target element[more]

In recent years, both domestically and internationally, relatively mature analytical methods have been established for the detection and testing of trace elements in foodstuffs, with significant advances also made in sample preparation and data processing[more]

Polyethylene terephthalate, commonly known as PET plastic, has the molecular formula (C₁₀H₈O₄)_n and is produced via the polycondensation reaction of alcohol esters.[more]

Secondary batteries contain cathode materials such as lithium nickel cobalt manganese oxide, lithium manganese oxide, lithium cobalt oxide, nickel hydride powder, and lithium iron phosphate, alongside auxiliary materials including copper, iron, aluminium,[more]

After digestion of the sample with aqua regia, the cadmium, lead and chromium in the sample solution are atomised in the ICP light source and excited to a high-energy state.[more]

The sample is digested using a mixture of sulphuric acid and nitric acid until the solution becomes clear, then made up to volume with water, and the content is determined by ICP-AES.[more]

In industrial production, iron-based vessels and pipelines are prone to iron corrosion and the formation of scale, which seriously compromises operational safety and quality assurance.[more]

The 2025 edition of the Pharmacopoeia of the People's Republic of China (hereinafter referred to as the Chinese Pharmacopoeia) stipulates explicit microbial limits for multiple Chinese herbal preparations. Consequently, effective detection techniques[more]