亞硫酸氫鈉是一種只能存在于溶液中的無機化合物，在常溫下是不穩(wěn)定的固體。在亞硫酸氫鹽中，只有亞硫酸氫銣RbHSO3、亞硫酸氫銫CsHSO3和季銨鹽NR4HSO3在室溫下是穩(wěn)定的。在空氣中易氧化成硫酸鹽。
Sodium bisulfite is an inorganic compound that can only exist in solution and is an unstable solid at room temperature. Among bisulfite salts, only rubidium bisulfite rbhso3, cesium bisulfite cshso3 and quaternary ammonium salt nr4hso3 are stable at room temperature. It is easy to oxidize into sulfate in the air.
市場上有NaHSO3，主要成分是焦亞硫酸鈉Na2S2O5。
NaHSO3 is available on the market, and the main component is sodium pyrosulfite Na2S2O5.
準備
prepare
焦亞硫酸鈉加水可制得，化學(xué)式為：Na2S2O5(s)H2O(l)→2NaHSO3(aq)
Sodium pyrosulfite can be prepared by adding water. The chemical formula is: Na2S2O5 (s) H2O (L) → 2nahso3 (AQ)
亞硫酸氫鈉也可以通過氫氧化鈉或碳酸氫鈉與二氧化硫反應(yīng)生成：SO2氫氧化鈉→NaHSO3；SO2NaHCO3→NaHSO3CO2
Sodium bisulfite can also react with sulfur dioxide through sodium hydroxide or sodium bicarbonate: SO2, sodium hydroxide → NaHSO3; SO2NaHCO3→NaHSO3CO2
然而，嘗試結(jié)晶該化合物僅產(chǎn)生焦亞硫酸鈉，化學(xué)式為Na2S2O5。
However, trying to crystallize the compound only produces sodium pyrosulfite, with the chemical formula of Na2S2O5.
反應(yīng)
reaction
亞硫酸氫鈉與活性醛和酮反應(yīng)形成亞硫酸氫鈉加合物。該反應(yīng)可用于避免在加成羰基和HCN時使用劇毒HCN。方法如下：先將羰基化合物加入亞硫酸氫鈉中，再加入等量的NaCN。
Sodium bisulfite reacts with active aldehydes and ketones to form sodium bisulfite adducts. This reaction can be used to avoid the use of highly toxic HCN in the addition of carbonyl and HCN. The method is as follows: first add carbonyl compounds to sodium bisulfite, and then add the same amount of NaCN.
預(yù)防
prevention
氫氧化鉀廠家建議人們不要攝入超過0.7mg/kg的亞硫酸氫鈉。對亞硫酸鹽過敏的人不應(yīng)食用含有E220-229（所有亞硫酸鹽，包括E222、亞硫酸氫鈉）的食物。亞硫酸氫鈉與酸接觸會產(chǎn)生有毒氣體。
Potassium hydroxide manufacturers advise people not to consume more than 0.7mg/kg sodium bisulfite. People who are allergic to sulfites should not eat food containing e220-229 (all sulfites, including e222 and sodium bisulfite). Contact between sodium bisulfite and acid will produce toxic gas.

處置與儲存
Disposal and storage
操作：密閉操作，加強通風(fēng)。操作人員須經(jīng)過專門培訓(xùn)，嚴格遵守操作規(guī)程。建議操作人員佩戴自吸過濾式防塵口罩，戴化學(xué)安全防護眼鏡，穿防毒物滲透工作服，戴橡膠手套。避免產(chǎn)生粉塵。避免與酸類接觸。搬運時輕裝輕卸，防止包裝破損。配備泄漏應(yīng)急處理設(shè)備。倒空的容器可能殘留有害物。
Operation: closed operation, strengthen ventilation. Operators must receive special training and strictly abide by the operating procedures. It is recommended that operators wear self-priming filter type dust masks, chemical safety protective glasses, poison proof overalls and rubber gloves. Avoid dust generation. Avoid contact with acids. Handle with care to prevent package damage. Equipped with leakage emergency treatment equipment. Emptied containers may leave harmful substances.
儲存：儲存于陰涼、通風(fēng)的庫房。遠離火種、熱源。應(yīng)與酸類等分開存放，切忌混儲。不宜久存。儲區(qū)應(yīng)備有合適的材料收容泄漏物。
Storage: store in a cool and ventilated warehouse. Keep away from kindling and heat sources. It should be stored separately from acids and avoid mixed storage. It should not be stored for a long time. The storage area should be equipped with appropriate materials to contain leakage.
運輸：起運時包裝要完整，裝載應(yīng)穩(wěn)妥。運輸過程中要確保容器不泄漏、不倒塌、不墜落、不損壞。嚴禁與酸類、食用化學(xué)品等混裝混運。運輸途中應(yīng)防曝曬、雨淋，防高溫。車輛運輸完畢應(yīng)進行清掃。
Transportation: the package shall be complete and the loading shall be stable at the time of shipment. Ensure that the container does not leak, collapse, fall or damage during transportation. It is strictly prohibited to mix with acids, edible chemicals, etc. During transportation, it shall be protected from sun exposure, rain and high temperature. The vehicle shall be cleaned after transportation.
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