Ammonium sulfate CAS 7783-20-2 ọdịnaya 99.0 ~ 100.5%

(NH4) 2SO4 132.14
Ammonium sulfate (7783-20-2).
Nkọwa
Ammonium sulfate nwere NLT 99.0% na NMT 100.5% nke (NH4) 2SO4.
Nchọpụta
• A. Nnwale njirimara-General, Ammonium <191>: Ngwọta (1 na 20) na-emezu ihe achọrọ.
• B. Nnwale njirimara-General, Sulfate <191>: Ngwọta (1 na 20) na-emezu ihe achọrọ.
ASSAY
• Usoro
Ihe atụ: 2.5 g nke ammonium sulfate
Titrimetric usoro
(Lee Titrimetry <541>.)
Ụdị: Titration fọdụrụnụ
Titrant: 1 N sodium hydroxide VS
Azụ titrant: 1 N sulfuric acid VS
Nchọpụta njedebe: Colorimetric
Oghere: 50.0 ml nke 1 N sodium hydroxide VS, tụrụ nke ọma
Nyocha: Tinye ihe nlele ahụ na flask conical 500-mL wee gbazee na mmiri 50 ml.Tinye 50.0 ml nke 1 N sodium hydroxide VS, tinye oghere nzacha n'olu nke flask ahụ, ma sie ruo mgbe a ga-achụpụ amonia (ihe dịka 10-15 min), dịka e ji akwụkwọ litmus kpebisie ike.Jụụ, tinye 0.15 ml nke thymol blue TS, ma titrate ngafe sodium hydroxide na 1 N sulfuric acid VS.Mee mkpebi efu.
Gbakọọ pasenti nke ammonium sulfate [(NH4)2SO4] n'ime ihe nlele emere:
Nsonaazụ = [(BV) × N × F ×100]/W
B = 1 N sulfuric acid VS nke oghere (mL) riri.
V = 1 N sulfuric acid VS nke Sample (mL) riri
N = ezigbo ọnọdụ nke azụ titrant (mEq/ml)
F = ihe nhata, 66.07 mg/mEq
W = arọ nke ihe nlele (mg)
Usoro nnabata: 99.0% -100.5%
IHE adịghị ọcha
• Ihe fọdụrụ na mgbanye <281>
Ihe atụ: 20 g
Ụkpụrụ nnabata: NMT 0.005%
• Oke nke ihe na-adịghị edozi
Ihe atụ: 20 g
Nyocha: Nyefee ihe nlele ahụ na beaker kpuchie, ma gbazee na mmiri 200 ml.Kpoo ọkụ ka o sie, ma kpoo ọkụ na bat maka awa 1.Wepụ ihe ngwọta na-ekpo ọkụ site na mpempe akwụkwọ sintered-glass nke ọkara porosity (10-15 µm).Jiri mmiri ọkụ saa beaker na nzacha, kpochaa ihe nkedo ahụ na 105, dị jụụ n'ime ihe nchacha, ma tụọ ya.
Usoro nnabata: NMT 1 mg nke ihe na-adịghị edozi (0.005%) ka achọtara.
• Oke nke Phosphate
Ọkọlọtọ phosphate ngwọta, Phosphate reagent A, na Phosphate reagent B: Kwadebe dị ka eduzi ya maka Phosphate na Reagents n'okpuru Reagents, Indicators, and Solutions-General Tests for Reagents.
Ihe atụ: 4.0 g
Njikwa: 0.2 mL nke ọkọlọtọ phosphate ngwọta
Nyocha
[Rịba ama-Nnwale maka Sample na Njikwa ka a na-eme nke ọma na tubes atụnyere agba.]
Gbazee ihe nlele ahụ na 25 ml nke 0.5 N sulfuric acid, tinye 1 ml nke ọ bụla nke reagent Phosphate A na Phosphate reagent B, ma kwe ka guzoro na ụlọ okpomọkụ maka awa 2.Gaa n'ihu na njikwa ahụ site na iji otu ọnụọgụ nke otu reagents dị na nnwale maka Sample.
Nkwenye nnabata: Agba anụnụ anụnụ ọ bụla enwetara na Sample ekwesịghị ịfe nke emere na njikwa (NMT 5 ppm).
• Chloride na sulfate, Chloride <221>
Ngwọta chloride ọkọlọtọ: Nyefee 165 mg nke sodium chloride na flask volumetric 100-mL.Gbanyụọ ma gbanye mmiri ka ọ bụrụ olu.Nyefee 10.0 mL na 1000-mL volumetric flask, na itughari na mmiri na olu iji nweta ngwọta na-enwe a ịta nke 10 µg/mL nke chloride.
Usoro nnabata: Akụkụ 2-g na-egosi na ọ nweghị chloride karịa dabara na 1.0 ml nke Standard chloride solution (NMT 5 ppm).
• Oke nke nitrate
Ngwọta nitrate ọkọlọtọ na ngwọta Brucine sulfate: Kwadebe dị ka eduzi ya maka Nitrate na Reagents n'okpuru Reagents, egosi, na Ngwọta-General Ule maka Reagents.
Ngwọta ihe atụ: Gbarie 1.0 g na mmiri 3 ml site na ikpo ọkụ na mmiri ịsa mmiri na-esi esi, ma gbakwunye ngwọta Brucine sulfate iji mee 50 ml.
Ngwọta nchịkwa: Na 1.0 ml nke Standard nitrate ngwọta tinye 1.0 g nke ammonium nitrate, wee tinye Brucine sulfate ngwọta iji mee 50 ml.
Oghere: 50 ml nke Brucine sulfate ngwọta
Nyocha: Kpoo ihe ngwọta nlele, ngwọta njikwa, na oghere n'ime mmiri ịsa mmiri na-esi esi maka nkeji 15 na-eji nwayọọ nwayọọ na-emegharị oge, wee jụọ oyi ngwa ngwa n'ime mmiri ịsa ahụ na okpomọkụ.Gbanwee spectrophotometer dabara adaba na oghere oghere na nnabata efu na 410 nm.Kpebie nnabata nke ngwọta Sample, rịba ama nsonaazụ, ma dozie ngwa ahụ na ngwọta Sample ka ọ ghara ịmịkọrọ efu.Kpebie nnabata nke ngwọta nchịkwa.
Usoro nnabata: Ọgụgụ nnabata maka ihe ngwọta Sample adịghị agafe nke ahụ maka njikwa njikwa (NMT 10 ppm).
• Ígwè <241>
Ngwọta nlele: gbazee 2.0 g na mmiri 40 ml, tinye 2 ml nke hydrochloric acid.
Usoro nnabata: NMT 5 ppm
Nnwale akọwapụtara
• Nnwale ngụkọ microbial <61> na Nnwale maka Microorganisms akọwapụtara <62>: Ngụkọta ọnụ ọgụgụ microbial aerobic anaghị agafe 1000 cfu/g, yana ngụkọta agwakọta ebu na yeasts anaghị agafe 10 cfu/g.
• pH <791>: 5.0-6.0 na ngwọta (1 n'ime 20)
NKWUO GBASARA YA
• Nkwakọ ngwaahịa na Nchekwa: Chekwaa n'ime igbe emechiri nke ọma.Ọnweghị ihe nchekwa achọrọ akọwapụtara.