l) Contamination metals: mercury (Hg)<\/strong><\/span>
\n (1) n as high as 20 mm;<\/span>
\n (2) Tube destruction;<\/span>
\n (3) The destruction of 250 mL flask round basis;<\/span>
\n (4) flask 1000 mL, 500 mL and 100 mL calibrated;<\/span>
\n (5) glass measuring 25 mL;<\/span>
\n (6) Pipette 0.05 mL measuring scale or micro burette calibrated;<\/span> and<\/span>
\n (7) The glass cup of 500 mL.<\/span><\/p>\n

Reagent:<\/span>
\n (1) A solution of sulfuric acid, H2SO4 9 M;<\/span>
\n (2) solution of nitric acid, HNO3 7 M;<\/span>
\n (3) A mixture HNO3: HClO4 (1: 1);<\/span>
\n (4) Hydrogen peroxide, H2O2 concentrated;<\/span>
\n (5) A solution of sodium molybdate, NaMoO4.7H2O 2%;<\/span>
\n (6) reducing solution;<\/span> Mix 50 mL of H2SO4 with 300 mL of distilled water in a 500-ml beaker and let cool to room temperature and then add 15 g NaCl, 15 g of hydroxylamine sulfate, and 25 g of SnCl2.<\/span> Transfer to a 500 mL volumetric flask and dilute with distilled water to mark the line.<\/span>
\n (7) A solution of sodium borohydride, NaBH4;<\/span> 3 g powder dissolved NaBH4 and 3 g NaOH with distilled water in a 500 mL volumetric flask.<\/span>
\n (8) A solution of diluent;<\/span> enter 300 mL to 500 mL of distilled water into a 1000 mL volumetric flask and add 58 mL HNO3 and then add 67 mL H2SO4.<\/span> Dilute with distilled water up to the mark and shake lines.<\/span>
\n (9) standard solution 1000 mg \/ mL Hg;<\/span> dissolve 0.1354 g HgCl2 with approximately 25 mL of distilled water in a 250-ml beaker and put into 100 mL volumetric flask and then diluted with distilled water up to the mark line.<\/span>
\n (10) the raw solution 1 mg \/ mL Hg;<\/span> pipette 1 ml of standard solution of 1000 mg \/ mL Hg into 1000 mL volumetric flask and dilute with diluent solution to mark the line and shake.<\/span> The second standard solution has a concentration of 1 mg \/ mL.<\/span>
\n (11) working standard solution of Hg;<\/span> and pipette 0.25 mL respectively;<\/span> 0.5 mL;<\/span> 1 mL;<\/span> and 2 ml of standard solution of 1 mg \/ mL into a separate 100 mL volumetric flask and dilute with diluent solution to mark the line.<\/span> The working standard solution has a concentration of 0.002 5 mg \/ mL;<\/span> 0.005 mg \/ mL;<\/span> 0.01 mg \/ mL;<\/span> 0.02 mg \/ mL Hg;<\/span> and<\/span>
\n (12) Stone boiling.<\/span><\/p>\n

Ways of working:<\/span>
\n (1) Wet ashing<\/strong><\/span>
\n (a) Weigh 5 g sample (m) carefully into destruction flask and add 25 mL H2SO4 9 M, 20 mL HNO3 7 M, 1 mL of 2% solution of sodium molybdate, and 5 grains up to 6 Boiling stones;<\/span>
\n (b) Connect the destruction flask with cooling and heat over electric heating for 1 hour.<\/span> Stop heating and leave for 15 minutes;<\/span>
\n (c) Add 20 mL of a mixture of HNO3: HClO4 (1: 1) through refrigeration,<\/span>
\n (d) Stop the water flow in the cooling and heat over high heat until white vapors arise.<\/span> Continue heating for 10 minutes and cool;<\/span>
\n (e) Add 10 ml of distilled water through the cooling carefully while pumpkin shake;<\/span>
\n (f) Bring to a boil again for 10 minutes;<\/span>
\n (g) Turn off electric heating and cooling wash with 15 mL of distilled water 3 times<\/span>
\n (h) Then cool to room temperature;<\/span>
\n (i) Move the destruction of the sample solution into 100 mL volumetric flask quantitatively and dilute with distilled water to mark the line (V);<\/span>
\n (j) Pipette 25 mL of the above solution into a 100 mL volumetric flask and dilute with diluent solution to mark the line;<\/span>
\n (k) Prepare a blank solution by the addition of reagents and the same treatment as an example;<\/span>
\n (l) Add the solution to reducing the working standard solution Hg, the sample solution and the blank solution tool “HVG”;<\/span>
\n (m) Read the absorbance of the working standard solution, the sample solution and reference solution uses no flame AAS at a wavelength of 253.7 nm;<\/span>
\n (n) Create a calibration curve between metal concentrations (mg \/ mL) as the X-axis and absorbance as the Y axis;<\/span>
\n (o) Plot the readings solution is an example of the calibration curve (C);<\/span>
\n (p) Perform Duplo construction;<\/span> and<\/span>
\n (q) Calculate the Hg content in the sample.<\/span><\/p>\n

(2) using a microwave digester destruction or the destruction of the closed system<\/strong><\/span>
\n (a) Weigh 1 g sample (m) to the destruction tube and add 5 ml HNO3, 1 mL of H2O2 and then close tightly;<\/span>
\n (b) Put it in the microwave digester and working according to the user manual tools;<\/span>
\n (c) Move the destruction of the sample solution into a 50 mL volumetric flask quantitatively and dilute with distilled water to mark the line (V);<\/span>
\n (d) Prepare a blank solution by the addition of reagents and the same treatment as an example;<\/span>
\n (e) Add the solution to reducing the working standard solution, the sample solution and reference solution at HVG tool;<\/span>
\n (f) Read the absorbance of the working standard solution, the sample solution and reference solution uses no flame AAS at a wavelength of 253.7 nm;<\/span>
\n (g) Create a calibration curve between metal concentrations (mg \/ mL) as the X-axis and absorbance as the Y axis;<\/span>
\n (h) Plot the readings solution is an example of the calibration curve (C);<\/span>
\n (i) Perform Duplo construction;<\/span> and<\/span>
\n (j) Calculate the Hg content in the sample.<\/span><\/p>\n

m) contaminants arsenic (As)<\/strong><\/span>
\n<\/strong> Principle:<\/strong><\/span>
\n Examples didestruksi with acid into a solution of arsenic.<\/span> AS5 + solution is reduced by KI into AS3 + and reacted with NaBH4 or SnCl2 forming AsH3 are then read by Atomic Absorption Spectrophotometer (AAS) at a wavelength of 193.7 nm maximum.<\/span>
\n Equipment:<\/span>
\n (1) Atomic Absorption Spectrophotometer (AAS) equipped with lights and a cathode As hydride vapor generator (HVG) calibrated;<\/span>
\n (2) The furnace is calibrated with a precision of 1 \u00b0 C;<\/span>
\n (3) Microwave digester;<\/span>
\n (4) Balance analytical calibrated to the nearest 0.1 mg;<\/span>
\n (5) electric heaters;<\/span>
\n (6) or Bunsen Burner;<\/span>
\n (7) Kjeldahl flask of 250 ml;<\/span>
\n (8) A flask made of round 50 mL borosiklat unfounded.<\/span>
\n (9) flask 1000 mL, 500 mL, 100 mL, and 50 mL, calibrated;<\/span>
\n (10) glass measuring 25 mL;<\/span>
\n (11) Pipette 25 mL volumetric calibrated;<\/span>
\n (12) Pipette 0.05 mL measuring scale or micro burette calibrated;<\/span>
\n (13) porcelain cup capacity of 50 ml;<\/span> and<\/span>
\n (14) Glass cup of 200 mL.<\/span><\/p>\n

Reagent:<\/span>
\n (1) Nitric acid, HNO3;<\/span>
\n (2) sulfuric acid, concentrated H2SO4;<\/span>
\n (3) perchloric acid, HClO4 concentrated;<\/span>
\n (4) Ammonium oxalate, (NH4) 2C2O4 saturated;<\/span>
\n (5) Hydrogen peroxide, H2O2 concentrated;<\/span>
\n (6) A solution of sodium borohydride, NaBH4;<\/span> 3 g NaBH4 dissolved and 3 g NaOH with distilled water up to the line mark in 500 mL volumetric flask.<\/span>
\n (7) A solution of hydrochloric acid, HCl 8 M;<\/span> Dilute 66 mL of concentrated HCl into 100 mL volumetric flask with distilled water up to the mark line.<\/span>
\n (8) A solution of tin (II) chloride, SnCl2.2H2O 10%;<\/span> Weigh 50 g SnCl2.2H2O into a 200 ml beaker and add 100 ml of concentrated HCl.<\/span> Heat until a clear solution and let cool then pour into a 500 mL volumetric flask and dilute with distilled water to mark the line.<\/span>
\n (9) A solution of potassium iodide, KI 20%;<\/span> Weigh 20 g KI in 100 mL volumetric flask and dilute with distilled water to mark the line (the solution should be prepared immediately before use).<\/span>
\n (10) A solution of Mg (NO3) 275 mg \/ mL;<\/span> dissolve 3.75 g of MgO with 30 mL H2O carefully, add 10 ml of HNO3, cool and dilute to 50 ml with distilled water;<\/span>
\n (11) standard solution 1000 mg \/ mL As;<\/span> dissolve 3 g As2O3 1,320 dry with little NaOH 20% and neutralize with HCl or HNO3 1: 1 (1 part acid: 1 part water).<\/span> Enter into a 1 L volumetric flask and dilute with distilled water to mark the line.<\/span>
\n (12) standard solution 100 mg \/ mL As;<\/span> pipette 10 ml of standard solution As 1000 ug \/ mL in 100 mL volumetric flask and dilute with distilled water to mark the line.<\/span> The second standard solution has a concentration of 100 ug \/ mL As.<\/span>
\n (13) the raw solution 1 mg \/ mL As;<\/span> and pipette 1 mL of arsenic standard of 100 mg \/ L in a 100 mL volumetric flask and dilute with distilled water to mark the line.<\/span> The third standard solution has a concentration of 1 mg \/ mL As.<\/span>
\n (14) As working standard solution;<\/span> pipette 1.0 mL respectively;<\/span> 2.0 mL;<\/span> 3.0 mL;<\/span> 4.0 mL and 5.0 mL of standard solution of 1 mg \/ mL As to the separate 100 mL volumetric flask and dilute with distilled water to mark the line and shake the working standard solution has a concentration of 0.01 mg \/ mL;<\/span> 0.02 mg \/ mL;<\/span> 0.03 mg \/ mL;<\/span> 0.04 g \/ mLdan 0.05 ug \/ mL As.<\/span><\/p>\n

Ways of working:<\/strong><\/span>
\n<\/strong> (1) Wet ashing<\/strong><\/span>
\n (a) Weigh 5 g to 10 g sample (m) into a 250-ml Kjeldahl flask, add 5 ml to 10 ml of concentrated HNO 3 and 4 mL to 8 mL of concentrated H2SO4 with caution;<\/span>
\n (b) After the reaction is finished, reheat and add HNO3 little by little so that the sample is brown or blackish;<\/span>
\n (c) Add 2 mL HClO4 70% piecemeal and heat again so the solution becomes clear or yellow (in case authoring after addition of HClO4, HNO3 add another bit);<\/span>
\n (d) Cool, add 15 mL H2O and 5 mL (NH4) 2C2O4 saturated;<\/span>
\n (e) Heat causing steam SO3 neck flask;<\/span>
\n (f) Cool, transfer quantitatively into a 50 mL volumetric flask and dilute with distilled water to mark the line (V);<\/span>
\n (g) Pipette 25 mL of the above and add 2 ml of HCl 8 M, 0.1 mL of KI 20% then shake and allow at least 2 minutes;<\/span>
\n (h) Prepare a blank solution by the addition of reagents and the same treatment as an example;<\/span>
\n (i) Add a solution of reducing agent (NaBH4) into the working standard solution As, the sample solution and reference solution at HVG tool;<\/span>
\n (j) Read the absorbance of the working standard solution, the sample solution and reference solution uses no flame AAS at a wavelength of 193.7 nm;<\/span>
\n (k) Create a calibration curve between metal concentrations (mg \/ mL) as the X-axis and absorbance as the Y axis;<\/span>
\n (l) Plot the readings solution is an example of the calibration curve (C);<\/span>
\n (m) Perform Duplo construction;<\/span> and<\/span>
\n (n) Calculate the content of As in the example.<\/span>
\n (2) using a microwave digester destruction or the destruction of the closed system<\/strong><\/span>
\n<\/strong> (a) Weigh 1 g sample (m) to the destruction tube and add 5 ml HNO3, 1 mL of H2O2 and then close tightly;<\/span>
\n (b) put in the microwave digester and working according to the user manual tools;<\/span>
\n (c) after cooling, transfer the solution into the destruction of 25 mL volumetric flask quantitatively and dilute with distilled water to mark the line (V);<\/span>
\n (d) pipette 10 mL of destruction into the flask of borosilicate based round of 50 mL, add 1 mL solution of Mg (NO3) 2, uapkan above the electric heater to dry and arangkan.<\/span> Abukan in a furnace at a temperature of 450 \u00b0 C (\u00b1 1 hour);<\/span>
\n (e) cooled, diluted with 2.0 mL of 8 M HCl, 0.1 mL of KI 20% and leave at least 2 minutes.<\/span> Pour the solution into the sample tube on the tool;<\/span>
\n (f) prepare NaBH4 and HCl in place as determined by the tool;<\/span>
\n (g) As working standard solution pour 0.01 mg \/ mL;<\/span> 0.02 mg \/ mL;<\/span> 0.03 mg \/ mL;<\/span> 0.04 mg \/ mL;<\/span> 0.05 mg \/ mL and blanks into the sample tube 6 others.<\/span> Turn on or Bunsen burner and a key regulator of the flow of reagents and sample flow;<\/span>
\n (h) read the absorbance value of the highest standard solution and a sample of work As with blanks as a correction;<\/span>
\n (i) create a calibration curve between As concentrations (mg \/ mL) as the X-axis and absorbance as the Y axis;<\/span>
\n (j) plot the results of reading the sample solution for calibration curve (C);<\/span>
\n (k) to do the work Duplo;<\/span> and<\/span>
\n (l) calculate the content of As in the example.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

l) Contamination metals: mercury (Hg) (1) n as high as 20 mm; (2) Tube destruction; (3) The destruction of 250 mL flask round basis; (4) flask 1000 mL, 500 mL and 100 mL calibrated; (5) glass measuring 25 mL; (6) Pipette 0.05 mL measuring scale or micro burette calibrated; and (7) The glass cup of …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1820],"tags":[628,630,629,636,635,638,637,631,633,632,634],"class_list":["post-452","post","type-post","status-publish","format-standard","hentry","category-english","tag-in-tapioca","tag-in-tapioca-balls","tag-in-tapioca-pudding","tag-tapioca-in-bengali","tag-tapioca-in-bubble-tea","tag-tapioca-in-dog-food","tag-tapioca-in-gujarati","tag-tapioca-in-hindi","tag-tapioca-in-marathi","tag-tapioca-in-spanish","tag-tapioca-in-urdu"],"_links":{"self":[{"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/posts\/452","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/comments?post=452"}],"version-history":[{"count":1,"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/posts\/452\/revisions"}],"predecessor-version":[{"id":3150,"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/posts\/452\/revisions\/3150"}],"wp:attachment":[{"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/media?parent=452"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/categories?post=452"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tneutron.net\/pangan\/wp-json\/wp\/v2\/tags?post=452"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}