qīng fěn
2 English referencehyd hyd... > 2 English Reference
hydrargyri subchloridum [Landau Chinese-English Dictionary]
calomelas [Xiangya Medical Dictionary]
calomel [21st Century Bilingual Dictionary of Science and Technology]
Calomelas [中中醫學名词(2004)]
Calomelas(拉) [Chinese Medicine Nomenclature Validation Committee. Chinese Medicine Nomenclature (2004)]
calomel [Chinese Medicine Nomenclature Validation Committee. Nomenclature of Chinese medicine (2004)]
3 OverviewLight powder is the name of the Chinese medicine, out of the "Materia Medica Gleanings". It is mercurous chloride (Hg2Cl2)[1].
The Pharmacopoeia of the People's Republic of China (2010 edition) contains pharmacopoeial standards for this Chinese medicine.
4 Latin nameCalomelas (la) (Nomenclature of Traditional Chinese Medicine (2004))
5 English namecalomel (Nomenclature of Traditional Chinese Medicine (2004))
6 Alias for Light PowderMercury Powder, Mercury Powder, Putty Powder, and Sweeping Basin.
7 SourceLight powder is a crude crystallization of mercurous chloride.
Light powder is mercurous chloride (Hg2Cl2)[1].
8 OriginLight powder produced in Hubei, Hebei, Hunan, Yunnan and other places [2].
9 Sexual flavor attributed to the meridianlight powder flavor pungent, cold, toxic; into the liver, kidney meridian [2].
10 Light powder efficacy and treatmentLight powder external use with insecticide, attack poison, astringent sores, internal use of water, laxative effect [2]:
Light powder treatment of scabies, jaundice, scrofula, syphilis, chancre, skin ulcers, rosacea, chronic eczema, neurodermatitis: with other medicines and powdered externally mixed [2].
Light powder for edema and dropsy, urinary and faecal problems of the real evidence: internal use, 60 ~ 150 mg, more into the pill [2].
11 ContraindicationsBecause of the strong toxic reaction of light powder, it is prudent to take internally [2].
Pregnant women should not take powder[2].
12 Chemical composition of powderPowder mainly contains mercury chloride [2].
Light powder and water **** cooking is decomposed into mercuric chloride or mercury. Both are highly toxic [2].
13 Pharmacological effects of powderLight powder is used externally as a fungicide, and can also inhibit common pathogenic skin fungi [2].
Light powder taken internally stops abnormal fermentation in the intestines, blocking the absorption of electrolytes and water in the intestines and leading to diarrhea [2].
Light powder has a diuretic effect when absorbed in small amounts, but overdose can be toxic, leading to cardiac, hepatic, and renal lesions. It also causes damage to the ovaries [2].
14 Dietary contraindications during light powderAvoid eating all blood while taking light powder[3].
15 Pharmacopoeial Standard for Light Powder 15.1 NameLight Powder
Qingfen
CALOMELAS
15.2 SourceThis product is mercurous chloride (Hg2Cl2).
15.3 PropertiesThis product is white glossy scaly or snowflake crystals, or crystalline powder; the color slowly darkens when exposed to light. Gas is slight.
15.4 Identification(1) When the product meets calcium hydroxide test solution, ammonia test solution or sodium hydroxide test solution, it turns black.
(2) take the product, add an equal amount of anhydrous sodium carbonate, mixed, placed in a dry test tube, heating, that is, the decomposition of precipitation of metallic mercury, condensed in the test tube wall, the residue left in the tube with dilute nitric acid dissolved, filtration, the filtrate shows the identification of chloride (Appendix IV) reaction.
15.5 Check 15.5.1 MercuryTake 2g of this product, add 20ml of ether, shaking for 5 minutes, filtration, filtrate evaporate the ether, the residue add 10ml of water and dilute nitric acid 2 drops of solubility, according to the chloride inspection method (Appendix IX C) check, such as the occurrence of turbidity, and the control solution made of the same method with the standard 7ml of sodium chloride solution comparison, shall not be more concentrated.
15.5.2 Mercury beadsTake about 1g of this product, flat on white paper, with an enlarged microscope inspection, there should be no mercury beads.
15.5.3 Cauterization residueNot more than 0.1% (Appendix IXJ).
15.6 Determination of contentTake about 0.5g of this product, precision weighing, placed in an iodine flask, add water 10mi, shaking, then add iodine titration solution (0.05mol / L) 50ml, tightly corked, shaking vigorously until most of the test product is dissolved, and then added to the potassium iodide solution (5 → 10) 8ml, tightly corked, shaking vigorously until completely dissolved, titrated with sodium thiosulphate titration (0.05mol / L), and titrated with sodium thiosulphate titration (0.05mol / L). Titration with sodium thiosulfate titrant (0.lmol/L), to the near end point, add starch indicator solution, continue titration until the disappearance of blue color. Each lml of iodine titrant (0.05mol / L) is equivalent to 23.61mg of mercuric chloride (Hg2Cl2).
This product contains mercurous chloride (Hg2Cl2) shall not be less than 99.0%.
15.7 Sexual flavor and attributionPungent, cold; toxic. Attributed to the large intestine, small intestine meridian.
15.8 Functions and IndicationsExternally, it is used to kill worms, attack toxins and astringent sores; internally, it is used to dispel phlegm and eliminate stagnation, and to expel water and pass stool. It is used externally for scabies, ringworm, polycarbonates, syphilis, sores, eczema; internally for phlegm and saliva stagnation, dropsy, and unfavorable bowel movement.
15.9 Usage and DosageFor external use, powdered and mixed with the affected area. Internally, 0.1-0.2g each time, 1-2 times a day, multiple pills or capsules, gargle after serving.
15.10 NoteThis product is toxic, not to overdose; internal use caution; pregnant women are prohibited.
15.11 StorageShade, sealed, in a dry place.
15.12 Provenance