Boric acid powders, compound

Weigh all the ingredients separately. Iodine must be finely subdivided. Place the iodine in a glass mortar, add alcohol drop wise, and triturate until the iodine is reduced to a fine powder. Then add boric acid and lactose by geometric mixing until the alcohol evaporates. Dry the powder for about twenty minutes in the air and then pass through a 40 mesh sieve to break all the lumps. Transfer the powder into a wide-mouthed, four-ounce bottle. Label appropriately as Compounded Powder with the instructions of Apply to affected area twice daily as directed. ... 

The tetrasulfo-Pc complexes of a number of metals are made by the urea melt process by heating the powdered metal, or its acetate, with triammonium-4-sulfophthalate, urea, boric acid, and ammonium molybdate. The metals or metal compounds used are those of chromium (III), manganese(II), iron(II), iron(III), cobalt(II), and zinc(II). Selected synthetic examples of sulfo- and other derivatives of metal phthalocyanines are presented below. 

Figure 9.4 shows the X-ray diffraction output of a magnesium-potassium phosphate ceramic in which boric acid was added as a retardant. The amount of boric acid was 1 wt% of MgO in the powder blend. The X-ray diffraction pattern indicated that the polymeric coating on the MgO particles was a low-solubility magnesium-boron-phosphate compound, called liinebergite ... 

In powder mixtures, atmospheric moisture or water of crystallization from another ingredient is sufficient for sodium bicarbonate to react with compounds such as boric acid or alum. In liquid mixtures containing bismuth subnitrate, sodium bicarbonate reacts with the acid formed by hydrolysis of the bismuth salt. 

The curcumin method (in either the rosocyanin or rubrocurcumin version) has been applied for determining traee amounts of boron in biologieal materials [10], soils and plants [17], waters [51], silicon [52], chlorosilanes [20], uranium [1,53], zirconium and its alloys [53,54], nickel [55,56], copper alloys [56], cast iron and steel [12,57-59], beryllium and magnesium [53], and phosphates [2]. This method was also used for determining boric acid admixtures (about 0.05%) in powdered boron [11]. Some synthetic compounds having the structure similar to that of curcumin, were used in determining boron in water [60]. 

Boric acid was once used as an ingredient in talcum and diaper powders and in salves for diaper rashes because of its antiseptic properties. The compound was eventually banned for such uses, however, when regulators decided that it was too toxic if it accidentally entered the body through an open wound or by being swallowed. 

Boron compounds are also used as food preservatives, and boron compounds such as sodium octaborate are used to fireproof fabrics. Boric acid is also used as an insecticide, in particular for ants and cockroaches in the home. Compounds of borate are used in many other applications (e.g., as fertilisers, in face powders to add a lustre and a silky feel, and so on). 

Another reason for the poor sinterability is the extraordinarily high vapor pressure of boron oxides and suboxides. Since boron carbide powders are generally coated by a B2O3 layer [172] which quickly reacts to form boric acid, H3BO3, in humid atmosphere, vapor phase reactions are active at higher temperatures, in particular above 1500"C, providing a fast transport of boron compounds. Redox reactions such as... 

Germanes undergo oxidative condensation in the presence of Cu-powder with certain hydroxyl-containing compounds such as water, alcohols, phenols, carboxylic acids, and boric acid.— E ... 

Three dusting powders containing boric acid are included in the B.P.C., ue. Boric Talc, 5 per cent of boric acid and 10 per cent of starch in talc Compound Salicylic Acid Dusting Powder, 3 per cent of salicylic acid and 5 per cent of boric acid in talc and Compound Zinc Dusting Powder, containing 5 per cent boric acid, 25 per cent zinc oxide, 35 per cent starch and 35 per cent purified talc. Boric Acid and Starch Dusting Powder, containing 25 per cent of boric acid is official in the B. Vet,C,... 

Compound Dusting-powder of Salicylic Acid, B,P,C. Consists of 3 per cent salicylic acid and 5 per cent boric acid with talc. 

Compound Dusting-powder of Zinc B.P.C. Zinc oxide 25 per cent and boric acid 5 per cent with starch and talc. 

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