Comparing E516 - Calcium sulphate vs E923 - ammonium persulfate
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Popular questions
What is gypsum used for?
In foods (E516), gypsum (calcium sulfate) is used as a stabiliser/firming and anti‑caking agent, a tofu coagulant, and to adjust brewing water; outside food it’s used for plaster, drywall, and as a desiccant.
What is gypsum board?
Gypsum board (drywall) is a building panel with a calcium sulfate core faced with paper, used for interior walls and ceilings—it's a construction use of the same mineral, not a food application of E516.
What does gypsum do for soil?
It supplies calcium and sulfate without notably changing pH, and can improve structure and water infiltration in sodic (sodium-affected) soils by displacing sodium; it has little effect on non‑sodic clays.
What is selenite good for?
Selenite is the crystalline mineral form of gypsum (calcium sulfate); it’s used like gypsum in construction materials and as a source of calcium and sulfate, including limited food uses as additive E516.
How much gypsum to add to soil?
Apply based on a soil test: typical maintenance rates are about 10–40 lb per 1,000 sq ft (50–200 g/m²) for lawns/gardens, while reclaiming sodic soils can require much more (around 1–4 tons/acre, 2–9 t/ha). Over‑application won’t fix non‑sodic clays and can add unnecessary salts.
What is ammonium persulfate used for?
As E923, it has been used as a flour treatment/bleaching agent, though its authorization for food use is limited and varies by country (not permitted in the EU/UK). Outside food, it’s a strong oxidizing initiator used in polymerization, etching, and hair-bleaching products.
What products contain ammonium persulfate?
You may rarely find it in some flours where permitted, labeled as ammonium persulfate or E923; many regions no longer allow it in food. It’s more commonly present in hair-bleach powders, lab reagents (e.g., gel electrophoresis), and PCB etchants.
5. what aspects of your experiment are controlled by temed and ammonium persulfate?
TEMED and ammonium persulfate generate free radicals to initiate and control the rate of acrylamide polymerization, which affects gelation time and pore size/uniformity in gels. Handle both with care—they are irritants and strong oxidizers.
Ammonium persulfate how to make solution?
For food use, consumers should not be preparing solutions of E923; its food authorization is limited. In labs it’s typically dissolved freshly in water because it decomposes—follow your protocol and the SDS for concentrations and safety.
Ammonium persulfate how to make solution cu?
Copper etching with ammonium persulfate is an electronics application, not a food use; follow the product manufacturer’s instructions for concentration and temperature and observe oxidizer safety. Food use of E923 is restricted and not permitted in the EU/UK.