purchase of chemicals, glassware, filter paper and other miscellenious item for siol testing laboratory, uttar dinajpur. , supply of laboratory chemicals & glassware : (details specification appended separately in soq) , 2,4-dinitrophenylhydrazine : melting range 9after drying) 196 to 199; 196°c, sulfated ash nmt 0.1% , ammonium (solution 25%) : assay (nh3 ) nlt 25%, chloride (ci) nmt 0.00005 %, sulfate (so4) nmt 0.0002%, phosphate(po4) nmt 0002% substances reducing kmno4 conforms, heavy metals (as pb)nmt 0.00005% m, residue on ignition (as sulfate)nmt 0.002% , ammonium solution 25% : assay (nh3 ) nlt 25%, chloride (ci) nmt 0.00005 %, sulfate (so4) nmt 0.0002%, phosphate(po4) nmt 0002% substances reducing kmno4 conforms, heavy metals (as pb)nmt 0.00005% m, residue on ignition (as sulfate)nmt 0.002% , ammonium acetate : assay (ch3coonh4) ) nlt 97%, ph-value (5% w/v; water) 6.7 to 7.3, chloride (ci) nmt 0.0005 %, sulfate (so4) nmt 0.0001%,nitrate (no3 )nmt 0.001% , residue on ignition (as sulfate)nmt 0.001%, insoluble matter nmt 0.005% , ammonium fluoride : assay (nh4f) nlt 95 %, ph-value (5% w/v; water) nlt 5.7,hexafluorosilicate (sif6) nmt 0.2 %, sulfate (so4) nmt 0.02 %,iron (fe) nmt 0.002 %, lead (pb) nmt 0.002 %, non-volatilesubstances nmt 0.02 %. , ammonium heptamolybdate :assay( as moo3) 81 to 83, chloride (cl) nmt 0.002 %, nitrate(no3) conforms, sulfate (so4) nmt 0.02 %, lead (pb) nmt0.001 %, magnesium (mg) nmt 0.005 %, potassium(k) nmt0.01 %, sodium(na) nmt 0.01 %, insoluble matter nmt 0.005%, heavy metals (as pb) nmt 0.001 %, phosphate, arsenate,silicate ( as sio2) nmt 0.001 % , ammonium iron sulphate hexahydrate :assay [(nh4)2fe(so4)2.6h2o] 98.5 to 101.5, insoluble matternmt 0.01 %, iron (fe+++) nmt 0.01 %, zinc (zn) nmt 0.003 %,magnesium (mg) nmt 0.002 %, test solution[10% w/v; thesolution is clear & complete , l-ascorbic acid : assay (c6h8o6) 99.6 %, heavy metals (as pb) 0.001 %, residueon ignition (as sulfate) 0.1 % , azomethine-h :specification: absorptivity a 1% /1cm (236nm; 0.05%, 1cm,buffer solution ph 5.1) =1200, loss on drying (105°c) =2.0,suitability for photometric (determination of boron) conforms , barium chloride dehydrate :assay (bacl2.2h2o) nlt 99 %, ph-value (5% w/v; water) 5.2 to8.2, insoluble matter nmt 0.005 %, heavy metals (as pb) nmt0.0005 %, strontium (sr) nmt 0.1 %, oxidizing substances (asno3) nmt 0.005 %, loss on drying (150 °c) 14 to 16 , boric acid , boron standard solution (aas std)-1000ppm :traceable to srm from nist h3bo3 in h2o 1000 mg/i b certipur metrological traceability: directly traceable to nist srm 3107,lot 190605, certified value as mass fraction 1001mg/kg,associated uncertainty, u=k•u (k=2) as mass fraction ± 6mg/kg , bromocresol green indicator :transition range: ph 3.6 : yellow-green ph 5.2 : bluespecific extinction (e 1%/1cm; lambda : nlt 230 , specific extinction (e 1%/1cm; lambda: nlt 490 , loss on drying (105°c): nmt 3 % , ph 4.0 buffer solution :clear, colourless solution, ph-value of solution at 20 °c : 3.98to 4.02 , ph 7.0 buffer solution :clear, colourless solution, ph-value of solution at 20 °c : 6.98to 7.02 , ph 9.0 buffer solution: clear, colourless solution, ph-value of solution at 20 °c : 8.98to 9.02 , calcium chloride dehydrate :assay (cacl2.2h2o; complexometric) : 99 to 105, ph-value(5%; water, 25 °c) : 4.5 to 8.5, heavy metals (as pb): nmt0.0005 %, oxidisable substances(as no3): nmt 0.003 % , copper standard solution (aas std)- 1000 ppm :metrological traceability: directly traceable to nist srm 3114,lot 120618, certified value as mass fraction 986 mg/kg,associated uncertainty, u=k•u (k=2) as mass fraction ± 5mg/kg , di ethylene triaminepenta acetic acid : assay (complexometric, calc. on anhydrous substance) 100%,ph-value (saturated solution) 2.4 , diphenylamine indicator :purity (gc): nlt 98 %, melting range : 52.5 to 54, sulfated ash: nmt 0.03 %, loss on drying (over silica gel ) : nmt 1 %,substances insoluble in ethanol : conforms , ethanol- absolute(95% pure) : purity: 99%, acidity and alkalinity : = 30, density ( d 20°c / 20°c ): 0.790-0.793 , ethylene di amine tetra acetic acid di-sodium salt : assay (c10h14n2na2o8; : 99 to 101, ph of a 5% solution at25.0°c : 4 to 6 , insoluble matter : nmt 0.005 %,nitrilotriacetic acid : nmt 0.1, heavy metals (as pb) : nmt0.005 %, iron (fe) : nmt 0.01 % , glacial acetic acid: assay (ch3cooh) : nlt 99.7 % , non-volatile substances : nmt0.001 %, titratable base : nmt 0.0004 meq/g, colour (apha) :nmt 10 hu, heavy metals (as pb) : nmt 0.00005 %, aceticanhydride : nmt 0.1 % , glacial acetic acid :assay (ch3cooh) : nlt 99.7 % , non-volatile substances : nmt0.001 %, titratable base : nmt 0.0004 meq/g, colour (apha) :nmt 10 hu, heavy metals (as pb) : nmt 0.00005 %, aceticanhydride : nmt 0.1 % , gum acacia , hydrochloric acid (concentrated)- 35 % :assay (hcl) nlt : 35 %, heavy metals (as pb) : nmt 0.001 %,residue on ignition (as sulfate) nmt : 0.005 % , iron standard solution (aas std)- 1000 ppm :metrological traceability: directly traceable to nist srm3126a, lot 140812, certified value as mass fraction 987 mg/kg,associated uncertainty, u=k•u (k=2) as mass fraction ± 5mg/kg , manganese standard sol. (aas std)- 1000 ppm : metrological traceability: directly traceable to nist srm 3132,lot 050429, certified value as mass fraction 986 mg/kg,associated uncertainty, u=k•u (k=2) as mass fraction ± 5mg/kg , methyl red indicator :transition range : ph 4.4 : red, ph 6.2 : yellow specific extinction (e 1%/1cm; lambda max1 524 nm; ph 4.4)1577.1, specific extinction (e 1%/1cm; lambda max2 430 nm;ph 6.2) : 733.3 , mixed indicator : application test : conforms, ph-value (20°c) : 4.5-5.0 , nitric acid – 69% (concentrated) : assay (hno3) : 68 to 70, arsenic (as) : nmt 0.000001 %, heavymetals (as pb): nmt 0.00002 %, residue on ignition (assulfate) :nmt 0.0005 % , ortho phosphoric acid- 85% :assay (h3po4) 99 %, heavy metals (as pb) : 0.001 %,insoluble matter 0.001 % , ortho phosphoric acid- 85% :assay (h3po4) 99 %, heavy metals (as pb) : 0.001 %,insoluble matter 0.001 % , oxalic acid :assay (c2h2o4.2h2o) : 99.5 to 102, insoluble matter , potassium chloride : assay (kcl) nlt 99 %, ph-value (5% w/v; water) : 5.5 to 8.5,heavy metals (as pb) nmt 0.002 % , potassium dichromate :assay (k2cr2o7) : nlt 99 %, insoluble matter : nmt 0.005 %,loss on drying (105°c) : nmt 0.05 %, iron (fe) : nmt 0.001 %,calcium (ca) :nmt 0.003 %, sulfate (so4) : nmt 0.005 % , potassium dihydrogen orthophosphate :assay (kh2po4) ; nlt 99 %, ph-value (5% w/v; water) : 4.1 to4.5, loss on drying : nmt 0.2 %, insoluble matter : nmt 0.01%, heavy metals (as pb) : nmt 0.001 %, , potassium permanganate :identity k: conforms, mno4: conforms assay (kmno4) 99 %, sulfate (so4) 0.01 % , potassium standard solution (aas std)- 1000 ppm : metrological traceability: directly traceable to nist srm3141a, lot 140813, certified value as mass fraction 986 mg/kg,associated uncertainty, u=k•u (k=2) as mass fraction ± 5mg/kg , silver nitrate : assay (agno3) :99 %, substances not precipitated by :0.002 %,chloride (cl) : 0.0003 % , sodium bicarbonate- p free : assay (nahco3; acidimetric, calc.: 99.7 to 100.3, phosphate(po4) : nmt 0.001 %, insoluble matter : nmt 0.015 %, heavymetals (as pb) : nmt 0.0005 %, sulfur compounds (as so4) :nmt 0.003 %, ammonium (nh4) : nmt 0.0005 % , sodium chloride :assay (nacl) nlt 99 % 100.74 %, ph-value (5% w/v; water) 5to 9 6.17, insoluble matter nmt 0.005 % 0.002 % , sodium hydroxide pellets :assay (naoh) nlt 99.6 %, nitrogen compounds (n) nmt0.001 % 0.0004 %, heavy metals(as pb) nmt 0.002 % 0.0006% , sulfuric acid-98%(concentrated) :assay (h2so4): 97.94 %, kmno4 reducing substances (as so2)nmt 0.0002 %, residue on ignition (as sulfate) nmt 0.0005 % , tin(ii) chloride dehydrate :assay (sncl2.2h2o): 98 to 103, calcium (ca) : nmt 0.005 %,potassium (k) : nmt 0.005 %, sodium (na) : nmt 0.01 % , measuring cylinders, graduated, single metric scale, with pour out, withhexagonal base, class b,. (borosilicate glass) , measuring cylinders, graduated, single metric scale, with pour out, withhexagonal base, class b,. (borosilicate glass) , measuring cylinders, graduated, single metric scale, with pour out, withhexagonal base, class b,. (borosilicate glass) , measuring cylinders, graduated, single metric scale, with pour out, withhexagonal base, class b. (borosilicate glass) , measuring cylinders, graduated, single metric scale, with pour out, withhexagonal base, class b. (borosilicate glass) , measuring cylinders, graduated, single metric scale, with pour out, withhexagonal base, class b. (borosilicate glass) , flasks, erlenmeyer, conical, narrow mouth . (borosilicate glass) , flasks, erlenmeyer, conical, narrow mouth . (borosilicate glass) , flasks, erlenmeyer, conical, narrow mouth . (borosilicate glass) , flasks, erlenmeyer, conical, narrow mouth . (borosilicate glass) , flasks, volumetric, with interchangeable solid glass stopper, accuracy asper class b,. (borosilicate glass) , flasks, volumetric, with interchangeable solid glass stopper, accuracy asper class b, (borosilicate glass) , flasks, volumetric, with interchangeable solid glass stopper, accuracy asper class b,. (borosilicate glass) , flasks, volumetric, with interchangeable solid glass stopper, accuracy asper class b,. (borosilicate glass) , flasks, volumetric, with interchangeable solid glass stopper, accuracy asper class b,. (borosilicate glass) , flasks, volumetric, with interchangeable solid glass stopper, accuracy asper class b, (borosilicate glass) , beakers, griffin, low form, with spout. (borosilicate glass) , beakers, griffin, low form, with spout. (borosilicate glass) , beakers, griffin, low form, with spout. (borosilicate glass) , beakers, griffin, low form, with spout. (borosilicate glass) , beakers, griffin, low form, with spout. (borosilicate glass) , beakers, griffin, low form, with spout. (borosilicate glass) , autoburette, with glass stopcock, class b,. complies with is 1997/iso 385. supplied with reservoir andrubber bellow, with automatic zero facility. (borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , pipettes, measuring (mohr types), class b.(borosilicate glass) , funnels, plain, 60° angle, short stem . (borosilicate glass) , funnels, plain, 60° angle, short stem . (borosilicate glass) , glass rods , glass cuvette (quartz) , reagent bottle, wide mouth, graduated with screw cap. (borosilicate glass) , beaker with spout (material-pp) , beaker with spout (material-pp) , volumetric flask (material-pp) , volumetric flask (material-pp) , measuring cylinder graduated, with pour out. (material-pp) , funnels, plain, 60° angle, short stem. (material-pp) , funnels, plain, 60° angle, short stem. (material-pp) , wash bottle. (material-pp) , plastic tray , filter paper -1 ( pack of 500 sheets) , filter paper -42 ( pack of 100 sheets) , tissue roll