Hydrofluoric Acid - an overview | ScienceDirect Topics
Hydrofluoric acid (HFA) is the inorganic acid of elemental fluorine. HFA is used in fluorocarbons, fluoropolymers, aluminum production, stainless steel pickling, uranium processing, glass etching, oil well acidizing, gasoline production, removal of sand and scale from foundry castings, and as a laboratory reagent.
Hydrofluoric Acid - an overview | ScienceDirect Topics
Hydrofluoric acid (HF) is the most effective mineral acid for breaking up strong Si–O bonds to form SiF 6 − 2 ions in acidic solution. Silicates are converted to volatile SiF 4 , which will be lost in open vessel digestion procedures.
Hydrofluoric Acid - an overview | ScienceDirect Topics
Aqueous hydrofluoric acid can be freed from lead by adding 1 mL of 10% strontium chloride per 100 mL of acid, lead being co-precipitated as lead fluoride with the strontium fluoride. If the hydrofluoric acid is decanted from the precipitate and the process repeated, the final lead content in the acid is less than 0.003 ppm.
Hydrofluoric Acid - an overview | ScienceDirect Topics
Hydrofluoric acid (HF) is a dangerous inorganic acid that is used widely in the chemical industries, electronics manufacturing, glass etching, smelting, cleaning, and other industrial fields [1–3]. It exists in two forms: in a purified form (>99%), called anhydrous hydrofluoric acid, and in a dilute form, called aqueous hydrofluoric acid [4] .
Hydrofluoric Acid - an overview | ScienceDirect Topics
Hydrofluoric Acid. Hydrofluoric acid is a highly corrosive chemical primarily causing dermal injury to the hands. Hydrofluoric acid releases free hydrogen ions (H +) that penetrate and corrode the skin, potentially down to bone, producing bone demineralization and necrosis. The respiratory effects parallel those of the skin, except effects in ...
Hydrofluoric Acid - an overview | ScienceDirect Topics
Hydrofluoric Acid. Hydrofluoric acid is a corrosive that is commonly used in industrial applications and computer processing. It is used as a cleaning agent in the petroleum industry, in the production of high-octane fuel, glass etching, germicides, dyes, tanning, and fireproofing material, as well as in rust removal.
A review of hydrofluoric acid and its use in the car wash industry
2012年9月25日 · Hydrofluoric acid (HF) is a common ingredient in car wash cleaning solutions mainly because it is highly effective and relatively inexpensive. Particulate matter from brake pads and discs, tire wear, and abrasion of road surface accumulated on the exterior of automobiles are aggressively removed with the use of car wash cleaning solutions ...
Fatal poisoning from acute hydrofluoric acid ingestion
1986年7月1日 · A case of accidental oral poisoning with hydrofluoric acid in an adult is presented. The patient ingested the product from a drinking glass, mistaking it for water, and died approximately 90 minutes after the exposure. Severe acidemia and hypocalcemia were present, which resulted in refractory asystole.
Kinetic mechanics of the reactions between HCl/HF acid mixtures …
2016年8月1日 · At low concentration, hydrofluoric acid is a weak acid, but at high concentrations, the HF molecules in hydrofluoric acid solution associate to form nHF molecules via hydrogen bonds. Thus, a HF solution can become a strong acid (Ryss, 1960, Gordievskii et al., 1963).
Precisely sensing hydrofluoric acid by photonic crystal hydrogels ...
2023年3月15日 · It is a great challenge to detect hydrofluoric acid (HF) with high precision, good selectivity, and visual readouts characteristics. Herein, a new photonic crystal (PC) hydrogel HF sensor based on the “selective etching-induced swelling” mechanism has been developed.