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WIM,[ <br /> ..L�Ex x �,sy,p�ry:➢ � � e a -r.. `�4m"S.^< r,y3`rU. +ww­pnF g <br /> Y„ <br /> .7• <br /> 3 <br /> NITROGENt AMMONIA APPe_F_o Lc <br /> Page o <br /> Range:0-0.+4 mg?L <br /> Salicylate Method" <br /> For Water,Wastewater and Sea Water" <br /> Infr ductlon <br /> Ammonia nitrogen is a product of the microbiological decay of plant and animal protein, It can be reused <br /> directly by plants and commonly is used in commerical fertilimrs. <br /> The presence of ammonia nitrogen in raw surface waters is uncommon and indicates domestic pollution.Am- <br /> nwnla nitrogen in ground waters is normal due to natural microbial reduction processes. <br /> The Nessler Method for ammonia nitrogen testing is a sensitive,single-reagent test,free from most common <br /> ?r,.crferences. The method has been modified to use polyvinyl alcohol(PVA)and Rochelle Salt. PVA is <br /> used as a disperiant to produce more reproducible results and less staining of glass.vare;it also results in a <br /> clear solution of the reaction product, (A turbid suspension occurs when PVA is not used.)The Rochelle <br /> Salt eliminates Interference due to hardness. This method is applicable for determining ammonia nitrogen <br /> in drinking water, wastewater•+ and sea water,**A sample distillation may be required to remove severe <br /> interfering substances, Also, albuminoid nitrogen may be determined using distillation. Interferences and <br /> distillation are discussed in Note C. With distillation this method has been approved by the USEPA for <br /> NFDES reporting purposes. <br /> Ammonium nitrogen standard solutions for checking the accuracy of the test we available from Hach. <br /> A procedure detailing use of the Volueae®Ampule Standards System of standard additions is given in Note N. <br /> ,, !s WARNING <br /> Some of the chemicals and apparatus used in this procedure maybe hazardous ro the health and <br /> safety of the user if inappropriately handled ormcidentally misused.Please read all warnings <br /> on rhe labels and mad the softly section of this manual.Hazardous substances appear in italic <br /> F typeface when they air used in the test and deserve extra cane in handling.It is always good <br /> practice to wear safety glasses when hsndling chemicals. Wash thoroughly if concoct occurs. <br /> Follow instructions carefully. <br /> Sampling and Storage <br /> Collect samples in clean plastic or glass bottles.Add one drop of Sodium Thiosulfate Standard Solution,0.IN, <br /> for each 0.3 mg1L chlorine present for each liter of sample taken.Samples should be run as soon as possible <br /> after collection.Lf storage is necessary,add 2-mL Sulfuric Acid,ACS, for each liter or quart of sample taken <br /> using it glass serological pipet and pipet filler,Mix.Check the sample pH to be sure the pH is 2 or less.Add <br /> more gcid if necessary. <br /> i <br /> pH Adjustment <br /> Before testing,warm to room temperature and adjust the acidified sample to pH 7 by adding Sodium Hydroxide <br /> i Standard Solution,5.ON,and mixing thoroughly.Samples preserved in this manner can be stored at least 24 <br /> hours. When significant amounts of preservative ane used,a volume correction should be made for the extra <br /> t acid and base by dividing the total volume(sample+acid+base)by the sample volume and multiplying the <br /> result times the final test reading. <br /> - •hEepud Irom swlra�kMah Fa Mr 8aemivr,u„id wvzr ya!Mi.rt..vrr <br /> - --- `---;�- ---------- •Ir.w�arrv�e...iK Nae C�----- - ------------------ -------- ----- <br />