磷酸氫二鈉Di-Sodium hydrogenPhosphate(DSP)
化學(xué)式：Na2HPO4.nH2O(n=0,12)
別名： 二鈉
分子量：358.0
執(zhí)行標(biāo)準(zhǔn)：HG/T2965-2000(工業(yè)級(jí))
HG/T2920-2000(食品級(jí))
性狀：
十二水物為白色結(jié)晶體，相對(duì)密度1.52，易風(fēng)化，35℃熔融并失去5個(gè)結(jié)晶水，100℃時(shí)變成無(wú)水物，250℃時(shí)變成焦磷酸鈉；無(wú)水物為白色粉末, 易潮解;二者均易溶于水，水溶液呈弱堿性，不溶于醇。
用途:
十二水物用于鍋爐軟水劑，織物、木材和紙張的阻燃劑，生產(chǎn)洗滌劑，作釉藥和焊藥，在印染中作***漂白的穩(wěn)定劑，味精、紅***、青***、鏈***和污水生化處理制品等的培養(yǎng)劑，用于電鍍等；在食品工業(yè)中用于制造焙粉，作品質(zhì)改良劑，乳化劑，營(yíng)養(yǎng)強(qiáng)化劑，發(fā)酵助劑，粘結(jié)劑；無(wú)水物用于作阻燃劑，絲的增重劑，活性染料的助劑，在焊接和銅焊中代替硼砂使用。
包裝：
內(nèi)塑外編，每袋凈重25KG、50KG，貯于干燥通風(fēng)處
技術(shù)指標(biāo):
|
序號(hào) |
指標(biāo)名稱(chēng) |
無(wú)水物 |
十二水物 |
||
|
工業(yè)級(jí) |
食品級(jí) |
工業(yè)級(jí) |
食品級(jí) |
||
|
1 |
主含量%≥ |
98.0 |
98.0 |
97.0 |
97.0 |
|
2 |
P2O5% ≥ |
49.0 |
49.0 |
19.2 |
19.2 |
|
3 |
PH（1%水溶液） |
8.5-10.0 |
8.5-10.0 |
8.8-9.2 |
8.8-9.2 |
|
4 |
氯化物(以Cl計(jì))% ≤ |
|
|
0.05 |
0.014 |
|
5 |
***鹽%≤ |
|
|
0.7 |
0.25 |
|
6 |
氟化物（以F計(jì)）%≤ |
|
0.005 |
0.05 |
0.005 |
|
7 |
***（以Pb計(jì)）%≤ |
|
0.001 |
|
0.001 |
|
8 |
***（以As計(jì)）%≤ |
|
0.0003 |
0.005 |
0.0003 |
|
9 |
水不溶物%≤ |
0.10 |
0.10 |
0.05 |
0.05 |
Di-Sodium hydrogenPhosphate (DSP)
Molecular formula: Na2HPO4.nH2O (n=0,12)
Molecular weight: 358.0
Standard executed: HG/T2965-2000(Industrial Grade)
HG2920-2000(Food Grade)
CAS Number: 7758-79-4
Properties:
White or colorless crystalline free flowing solid, efflorescent in air, easily soluble in water, but insoluble in alcohol, its water solution is slightly alkaline, relative density at 1.52 g/cm3, melting point at 35℃
Uses:
Used as a fire-preventio agent for fabric, timber, and paper, also as water softening agent for boiler, food additive, buffering agent, solder, tanning agent, etc.
Packing and storage: In 25kg, 50kg, 1000kg net bags, store at a cool ,dry and well ventilated place.
Guaranteed Technical Specificati***:
|
No. |
Specificati*** |
Na2HPO4 (Anhydrous) |
Na2HPO4 .12H2O (Duohydrate) |
||
|
Industrial Grade |
Food Grade |
Industrial Grade |
Food Grade |
||
|
1 |
Main contents %≥ |
98.0 |
98.0 |
97.0 |
97.0 |
|
2 |
Phosphorus pentoxide,as P2O5 |
49.0 |
49.0 |
19.2 |
19.2 |
|
3 |
PH of 1% water solution |
8.5-10.0 |
8.5-10.0 |
8.8-9.2 |
8.8-9.2 |
|
4 |
Chloride(as Cl)max% |
|
|
0.05 |
0.014 |
|
5 |
Sulfate, as SO4 %≤ |
|
|
0.7 |
0.25 |
|
6 |
He***y metals, as Pb %≤ |
|
0.001 |
|
0.001 |
|
7 |
Arsenic, as As %≤ |
|
0.0003 |
0.005 |
0.0003 |
|
8 |
Fluoride, as F %≤ |
|
0.005 |
0.05 |
0.005 |
|
9 |
Water insoluble %≤ |
0.10 |
0.10 |
0.05 |
0.05 |