Selenious Acid｜化工社

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HCID 1091作成日：2026年10月27日

Selenious Acid

https://huagongshe.com/ja/chemical/1091

Selenious Acid の分子構造式

識別子と物理属性

CAS No.	14124-67-5
分子式	H2O3Se
平均分子量	128.99 g/mol
単同位体質量	129.91691522 g/mol
SMILES	O=[Se](O)O
InChIKey	MCAHWIHFGHIESP-UHFFFAOYSA-N
PubChem CID	1091
ChEMBL	CHEMBL2009089
ChEBI	CHEBI:26642
EC No.	231-974-7
DTXSID	DTXSID9024300

化学・物理的性質

極性表面積	57.5
水素結合供与体数	2
水素結合受容体数	3
回転可能結合数	0
重原子数	4
形式電荷	0
複雑度	26.3
物質分類	Other Classes -> Other Inorganic Compounds
農薬	Pesticide -> EPA IRIS
密度	3.004 at 59 °F (EPA, 1998) - Denser than waterwill sink3.004 @ 15 °C/4 °C3.0 g/cm³3 @25 °C
Color/Form	White hygroscopic crystals.Transparent, colorless, crystals.Hexagonal prisms.
溶解度	soluble90 parts/100 parts water @ 0 °C400 parts @ 90 °CVery sol in alcoholinsol in ammonia167 g/100 cc water @ 20 °CSolubility in water, g/100ml at 20 °C: 167
Human Drugs	FDA approved drugs -> Active ingredient
Decomposition	When heated to decomp ... emits toxic fumes of /selenium/.70 °C
融点	Decomposes at 158 °F (EPA, 1998)70 °C with decomposition.
蒸気圧	2 mmHg at 59 °F (EPA, 1998)2 mm Hg at 15 °C4.5 mm Hg at 35 °C7 mm Hg at 40.3 °CVapor pressure, Pa at 15 °C: 2662 [mm Hg] @15 °C
Physical Description	Selenious acid appears as colorless solid, transparent, colorless crystals. Used as a reagent for alkaloids and as an oxidizing agent. Isotope is used in labeling radiopharmaceuticals. (EPA, 1998)Deliquescent solid[Merck Index] Colorless or white hygroscopic solid[HSDB] Colorless or white odorless crystalline solid[MSDSonline]COLOURLESS HYGROSCOPIC CRYSTALS.
Dissociation Constants	2.46K1= 0.0024K2= 4.8X10-9
Other Experimental Properties	DELIQUESCENTGIVES OFF WATER UPON HEATING & SELENIUM OXIDE SUBLIMESOXIDIZED TO SELENIC ACID BY STRONG OXIDIZING AGENTS ... REDUCED TO SELENIUM BY MOST REDUCING AGENTS ... .Heat of formation, -531.3 kJ/mol @ 25 °C /endothermic/

安全性と法規制

GHS 分類	DangerH301+H331 (10.8%): Toxic if swallowed or if inhaled [Danger Acute toxicity, oralacute toxicity, inhalation]P260, P261, P264, P270, P271, P273, P301+P316, P304+P340, P316, P319, P321, P330, P391, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 231 reports by companies from 20 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.H314: Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
規制情報	Chemical: Selenious acid (H2SeO3)Regulation (EC) No 1831/2003 (amended)Status: Active Update: 17-08-2017 https://echa.europa.eu/registration-dossier/-/registered-dossier/5196Selenious acid: Does not have an individual approval but may be used under an appropriate group standardThe New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)
輸送ラベル（DOT）	Poison
火災危険	When heated to decomposition it emits toxic fumes of selenium. Avoid heating. (EPA, 1998)Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.
健康有害性	Selenious acid and its salts are capable of penetrating the skin and can produce acute poisonings. Causes irritations and burns of the skin. It is highly toxic orally. Inorganic selenium compounds may cause dermatitis. (EPA, 1998)
有害性の概要	A corrosive substance that can cause injury to the skin, eyes, and respiratory tractInhalation may cause pulmonary edemaMay cause skin sensitizationMay cause impairment of the CNS and liver[ICSC] Can cause irritation and burns to skinAfter a suicidal ingestion of Gun Blue, the patient had pulmonary edema and acute tubular necrosisSelenium levels in tissues were 9-90 times normalIn another poisoning case, a 2 year old girl ingested about 11 mL of gun blueing agentPlasma selenium levels were 20 times normal 5 hours after ingestion, but she survived

Special Reports

WHOEvaluation of The Available Toxicity Data On Selenium (1987). Properties and analysissources, levels and transport in the environmenthuman exposuremetabolismanimal studieseffects on manevaluation of the health risksquantitative assessment of exposure.NTISGovt Reports Announcements & Index (GRA&I), Issue 14 (1987). This bibliography contains citations concerning the toxicity, carcinogenicity, environmental pollution, and other hazards and adverse effects of selenium. The detection, characterization, analytical methods, and removal from the environment are discussed. Pollution from coal fired and geothermal power plants are considered. (This updated bibliography contains 349 citations, none of which are new entries to the previous edition.)NajaelRevue g'en'erale de s'ecurite - RGS 63: 65-72 (1987). Information note on the harmful effects of selenium compounds. Physical and chemical properties of selenium and its principal compoundsusespathology and toxicology (irritation of the skin and mucous membranesthese irritations are compensable under French law)radioactive seleniumfire hazardsFrench regulationsprotection.Environ Health Criteria: Selenium 58 (0): 1-306 (1987)For more Special Reports (Complete) data for SELENIOUS ACID (8 total), please visit the HSDB record page.

RCRA 要件

U204As stipulated in 40 CFR 261.33, when selenious acid, as a commercial chemical product or manufacturing chemical intermediate or an off-specification commercial chemical product or a manufacturing chemical intermediate, becomes a waste, it must be managed according to Federal and/or State hazardous waste regulations. Also defined as a hazardous waste is any residue, contaminated soil, water, or other debris resulting from the cleanup of a spill, into water or on dry land, of this waste. Generators of small quantities of this waste may qualify for partial exclusion from hazardous waste regulations (40 CFR 261.5).D010A solid waste containing selenium (such as selenious acid) may or may not become characterized as a hazardous waste when subjected to the Toxicity Characteristic Leaching Procedure listed in 40 CFR 261.24, and if so characterized, must be managed as a hazardous waste.

Reactivity Profile	SELENIOUS ACID decomposes when heated to toxic and volatile selenium dioxide. Serves as an oxidizing agent. Reacts exothermically with many reducing agents including hydroiodic acid, sulfurous acid, sodium hyposulfite, hydroxylamine salts, hydrazine salts, hypophosphorous acid, phosphorous acid [Merck]. Oxidizes many organic substances. Is oxidized to selenic acid by strong oxidizing agents.

大気基準

Listed as a hazardous air pollutant (HAP) generally known or suspected to cause serious health problems. The Clean Air Act, as amended in 1990, directs EPA to set standards requiring major sources to sharply reduce routine emissions of toxic pollutants. EPA is required to establish and phase in specific performance based standards for all air emission sources that emit one or more of the listed pollutants. Selenious acid is included on this list.

消火	To extinguish a fire involving this chemical you may use a dry chemical, carbon dioxide, foam or halon extinguishera water spray may also be used. (NTP, 1992)In case of fire in the surroundings, use appropriate extinguishing media.

応急処置措置

Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention .First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.Rinse mouth. Do NOT induce vomiting. Refer for medical attention .

応急処置

Signs and Symptoms of Selenious Acid Exposure: Signs and symptoms of acute selenious acid exposure include the following: garlic odor on breath, drooling, nasal irritation and burning sensation in nostrils, vomiting, hypotension (low blood pressure), dizziness, and poor reflexes. Pulmonary edema, cardiopulmonary arrest, and coma are possible complications. Contact with selenious acid often results in skin irritation and burns.

非火災時の漏出対応	Avoid inhalation and skin contact. Ventilate area of spill. Collect spilled material in most convenient and safe manner and deposit in sealed containers for reclamation or disposal in a secured disposal landfill. Liquid containing selenium inorganic compounds should be absorbed in vermiculite, dry sand, earth or similar material. (EPA, 1998)

処分方法	Generators of waste (equal to or greater than 100 kg/mo) containing this contaminant, EPA hazardous waste number U204, D010, must conform with USEPA regulations in storage, transportation, treatment and disposal of waste.Poor candidate for incineration.

漏出処分	Evacuate danger area! Consult an expert! Personal protection: complete protective clothing including self-contained breathing apparatus. Cover the spilled material with dry lime or soda ash. Carefully collect remainder. Then store and dispose of according to local regulations.

Preventive Measures

SRP: The scientific literature for the use of contact lenses in industry is conflicting. The benefit or detrimental effects of wearing contact lenses depend not only upon the substance, but also on factors including the form of the substance, characteristics and duration of the exposure, the uses of other eye protection equipment, and the hygiene of the lenses. However, there may be individual substances whose irritating or corrosive properties are such that the wearing of contact lenses would be harmful to the eye. In those specific cases, contact lenses should not be worn. In any event, the usual eye protection equipment should be worn even when contact lenses are in place.

体内負荷	Inhalation studies on rats show that 94% of selenious acid deposited in the lung was absorbed within four hours. A model based on these rat studies predicted that organ concentration in man due to inhalation of selenious acid ... in urban atmospheres will not contribute significantly to human body burdens.

Treatment

EYES: irrigate opened eyes for several minutes under running water. INGESTION: do not induce vomiting. Rinse mouth with water (never give anything by mouth to an unconscious person). Seek immediate medical advice. SKIN: should be treated immediately by rinsing the affected parts in cold running water for at least 15 minutes, followed by thorough washing with soap and water. If necessary, the person should shower and change contaminated clothing and shoes, and then must seek medical attention. INHALATION: supply fresh air. If required provide artificial respiration.

相互作用

The chemopreventive efficacies of selenate, selenite, selenium dioxide, selenomethionine and selenocystine were examined during the promotion phase of carcinogenesis in the 7,12-dimethylbenz(a)anthracene-induced mammary tumor model in rats. Each agent was added to the diet of a final concentration of 3 ppm selenium. In general, there was no significant difference in the potency of these five selenium compounds in inhibiting the development of mammary tumors. The interaction of vitamin E (500 ppm) with either selenite or selenomethionine was further characterized in a second carcinogenesis study. Results of this experiment suggested that vitamin E enhanced the protective effect of selenite but not that of selenomethionine. In an attempt to explore the synergistic mechanism of selenium and vitamin E, the effects of these two agents on mitogen induced blastogenesis and natural killer cytotoxic activity were also investigated. No consistent changes in these in vitro immune functions were detected resulting from supranutritional feeding of either selenite or vitamin E or both. ... /Selenite/The objectives of this study were a) to compare the efficacy of inorganic or organic selenium compounds in protecting against mammary tumorigenesis induced by 7,12-dimethylbenz(a)anthracene (DMBA)in rats and b) to study the interaction of vitamin C with either selenite (inorganic) or seleno-DL-methionine (organic) in chemoprevention. Control Sprague Dawley rats were fed a purified 55 corn oil diet containing 0.1 ppm selenium. Selenite or seleno-DL-methionine was added to the basal diet in concentrations of 2, 3, or 4 ppm starting 1 week after DMBA administration. The inhibitory response in mammary tumorigenesis with selenium supplementation was dose dependent. Both selenium compounds were found to be equally efficacious in prophylaxis, although at the 4 ppm level a slight reduction in growth was observed. /Selenite/The effects of cadmium, mercury (Hg), and three different chemicals forms of selenium (selenite, selenocystine, and selenomethionine) on ram spermatozoal motility and oxygen comsumption in vitro were studied over a 4 mo period. Concentrations of 10(-6) to 10(-2) M cadmium and mercury were injurious to spermatozoa as indicated by depressed motility and reduced oxygen uptake. Equimolar concentrations of selenium as selenite, selenocystine, or selenomethioine counteracted the toxicity of cadmium and mercury at low concentrations (10(-5) and 10(-6) M) but not at higher concentrations (10(-4) to 10(-2) M). ... /Selenite/

健康影響	Chronic oral exposure to high concentrations of selenium compounds can produce a disease called selenosis. The major signs of selenosis are hair loss, nail brittleness, and neurological abnormalities (such as numbness and other odd sensations in the extremities). Animal studies have shown that selenium may also affect sperm production and the female reproductive cycle. (L619)

毒性の概要

Selenium readily substitutes for sulfur in biomolecules and in many biochemical reactions, especially when the concentration of selenium is high and the concentration of sulfur is low. Inactivation of the sulfhydryl enzymes necessary for oxidative reactions in cellular respiration, through effects on mitochondrial and microsomal electron transport, might contribute to acute selenium toxicity. Selenomethionine (a common organic selenium compound) also appears to randomly substitute for methionine in protein synthesis. This substitution may affect the structure and functionability of the protein, for example, by altering disulfide bridges. Inorganic forms of selenium appear to react with tissue thiols by redox catalysis, resulting in formation of reactive oxygen species and causing damage by oxidative stress. (L619)

Signs and Symptoms

Burning sensation. Cough. Laboured breathing. Sore throat. Shortness of breath. Symptoms may be delayed.Redness. Pain. Blisters. Skin burns.Redness. Pain. Severe deep burns.Abdominal pain. Burning sensation. Sore throat. Diarrhoea. Nausea. Vomiting. Shock or collapse.Short-term oral exposure to high concentrations of selenium may cause nausea, vomiting, and diarrhea. Brief exposures to high levels of elemental selenium or selenium dioxide in air can result in respiratory tract irritation, bronchitis, difficulty breathing, and stomach pains. Longer-term exposure to either of these air-borne forms can cause respiratory irritation, bronchial spasms, and coughing. (L619)

Medical Surveillance

The following medical procedures should be made available to each employee who is exposed to selenium and its inorganic compounds at potentially hazardous levels: 1. Initial Medical Examination: A complete history and physical examination: The purpose is to detect existing conditions that might place the exposed employee at increased risk, and to establish a baseline for future health monitoring. Persons with a history of asthma, allergies, or known sensitization to selenium, or with a history of other chronic respiratory disease, gastrointestinal disturbances, disorders of liver or kidneys or recurrent dermatitis would be expected to be at increased risk from exposure. Examination of the eyes, respiratory system, liver, kidneys, and blood should be stressed. The skin should be examined for evidence of chronic disorders. Special consideration should be given to women of childbearing age since the possibility that selenium may be teratogenic might place these women in a high risk group. Urinalysis: Proper function of the kidneys is necessary to validate levels of selenium in the urine. A urinalysis should be obtained to include at a minimum specific gravity, albumin, glucose, and a microscopic /examination of/ centrifuged sediment. Liver function tests: Selenium causes liver damage and tumors in animals. A profile of liver function should be obtained by using a medically acceptable array of biochemical tests. The aforementioned medical examinations should be repeated on an annual basis. /Selenium and its inorganic compounds/

CERCLA 報告数量

Persons in charge of vessels or facilities are required to notify the National Response Center (NRC) immediately, when there is a release of this designated hazardous substance, in an amount equal to or greater than its reportable quantity of 10 lb or 4.54 kg. The toll free telephone number of the NRC is (800) 424-8802In the Washington metropolitan area (202) 426-2675. The rule for determining when notification is required is stated in 40 CFR 302.6 (section IV. D.3.b).Releases of CERCLA hazardous substances are subject to the release reporting requirement of CERCLA section 103, codified at 40 CFR part 302, in addition to the requirements of 40 CFR part 355. Selenious acid is an extremely hazardous substance (EHS) subject to reporting requirements when stored in amounts in excess of its threshold planning quantity (TPQ) of 1,000/10,000 lbs.