磷酸氫二鈉十二水
一、化學(xué)名：磷酸氫二鈉
二、分子式：Na2HPO4，Na2HPO4·2H2O，Na2HPO4·12H2O
三、分子量：無(wú)水物：141.96；二水物：177.99；十二水物：358.14
四、CAS：無(wú)水物：7558-79-4；二水物：10028-24-7；十二水物：10039-32-4
五、性狀：白色結(jié)晶性粉末和顆粒，易溶于水，不溶于乙醇，相對(duì)密度為1.52，熔點(diǎn)34.6℃，180℃時(shí)失去結(jié)晶水成無(wú)水物，無(wú)水物形式易吸潮。
六、用途：食品中作焙制品，防止氧化變色，奶制品的乳化劑，防止蛋白凝固，固體飲料起螯合，乳化緩沖作用。
七、包裝：內(nèi)襯聚乙烯塑料袋．外套復(fù)合塑料編織袋，每袋凈重25kg。
八、貯存與運(yùn)輸：本品應(yīng)貯存在干燥通風(fēng)清潔的庫(kù)房中，裝載運(yùn)輸時(shí)要輕裝輕放，防止包裝破損，防止受潮、受熱，運(yùn)輸過(guò)程中防止雨淋受潮，應(yīng)與有毒物品隔離。
| 質(zhì)量指標(biāo) | Specification | GB 1886-329-2021 | FCC VII | ||
| 含量Na2HPO4（以干基計(jì)），w/%? ≥ | Content Na2HPO4,( On dry basis),w/%≥ | 98.0 | 98.0 | ||
| 砷（As），mg/kg??????????????? ≤ | Arsenic(As),mg/kg? ?????????????≤ | 3.0 | 3.0 | ||
| 重金屬（以Pb計(jì)），mg/kg??????? ≤ | Heavy metal(as Pb),mg/kg???????? ≤ | 10 | ——— | ||
| 鉛（Pb），mg/kg ????????????????≤ | Lead(Pb),mg/kg????????????????? ≤ | 4.0 | 4.0 | ||
| 氟化物（以F計(jì)），mg/kg???????? ≤ | Fluorides(as F),mg/kg???????????? ≤ | 50.0 | 50.0 | ||
| 水不溶物，w/%??????????????? ≤ | Insoluble substances,w/%????????? ≤ | 0.2 | 0.2 | ||
| 干燥減量，w/% | Na2HPO4 ?????≤ | Loss on drying,w/% | Na2HPO4????????? ≤ | 5.0 | 5.0 |
| Na2HPO4·2H2O | Na2HPO4·2H2O | 18.0-22.0 | 18.0-22.0 | ||
| Na2HPO4·12H2O≤ | Na2HPO4·12H2O?? ≤ | 61.0 | ——— | ||
1、Chemical Name:?Disodium Phosphate
2、Molecular Formula:, Na2HPO4，Na2HPO4·2H2O，Na2HPO4·12H2O
3、Molecular Weight: Anhydrous: 141.96; Dihydrate: 177.99; Dodecahydrate: 358.14
4、CAS: Anhydrous: 7558-79-4; Dihydrate: 10028-24-7; Dodecahydrate: 10039-32-4
5、Character:?It is white or colorless rhombic crystalline or prismatic crystal. It’s easily soluble in water, but insoluble in ethanol. The relative density is 1.52?and melting point is 34.6℃. If heated to 180℃, it will lose crystal water and convert to anhydrous.
6、Usage: In food industry, it is used as agent for baking to avoid oxidation stain and as emulsifier in dairy product to prevent egg white from solidification. It is also used as emulsifier and chelating agent for solid drinks.
7、Packing:?It is packed with polyethylene bag as inner layer and a compound plastic woven bag as outer layer. The net weight of each bag is 25kg.
8、Storage and Transport:?It should be stored in a dry and ventilative warehouse, kept away from heat and moisture during transportation, unloaded with care so as to avoid damage. Furthermore, it must be stored separately from poisonous substances.