{"product_id":"horiba-ion-selective-electrode-filling-solutions","title":"Horiba Ion-Selective Electrode Filling Solutions","description":"\u003cp\u003eInternal filling solutions for HORIBA ion-selective electrodes. Each ISE requires its own specific electrolyte in the internal chamber — the solution is matched to the ion being measured and is not interchangeable between electrode types.\u003c\/p\u003e\n\n\u003cp\u003eThe filling solution sits behind the sensing membrane and provides the stable internal reference against which the sample is compared. As it becomes depleted or contaminated the electrode slows down, the calibration slope degrades, and readings begin to drift. Replacing the filling solution is routine maintenance, and it is usually the first thing to try when an ISE that used to work well starts calibrating poorly.\u003c\/p\u003e\n\n\u003ch3\u003eAvailable filling solutions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NH3-IFS\u003c\/strong\u003e — ammonia electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-CA-IFS\u003c\/strong\u003e — calcium electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-CL-IFS\u003c\/strong\u003e — chloride electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-F-IFS\u003c\/strong\u003e — fluoride electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-NO3-IFS\u003c\/strong\u003e — nitrate electrode filling solution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e500-K-IFS\u003c\/strong\u003e — potassium electrode filling solution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEach bottle is 500 mL. Always use the filling solution specified for your electrode.\u003c\/p\u003e\n\n\u003ch3\u003eWhen to replace it\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe calibration slope has fallen outside the acceptable range\u003c\/li\u003e\n\u003cli\u003eResponse has become slow, or readings drift instead of settling\u003c\/li\u003e\n\u003cli\u003eThe solution looks discolored, cloudy, or has visible crystals or deposits\u003c\/li\u003e\n\u003cli\u003eThe electrode has been in storage and is being returned to service\u003c\/li\u003e\n\u003cli\u003eFollowing any membrane or cartridge replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eGood practice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFill to the level specified in the electrode instructions — over- or under-filling both affect response\u003c\/li\u003e\n\u003cli\u003eExclude air bubbles from behind the membrane; they break the internal circuit\u003c\/li\u003e\n\u003cli\u003eDo not substitute a different ion's filling solution, or deionized water, for the correct electrolyte\u003c\/li\u003e\n\u003cli\u003eRecalibrate after replacing the filling solution, using standards with the matching ionic strength adjustor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated items\u003c\/h3\u003e\n\u003cp\u003eIon-selective electrode kits, replacement ISE cartridges and membranes, ion standard solutions and ionic strength adjustors are all stocked — see the \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba-parts-accessories\"\u003eHoriba Parts \u0026amp; Accessories\u003c\/a\u003e collection. Filling solutions for reference and combination pH electrodes are listed separately.\u003c\/p\u003e\n\n\u003cp\u003eBrowse all \u003ca href=\"https:\/\/envirotechonline.com\/collections\/horiba\"\u003eHORIBA instruments\u003c\/a\u003e.\u003c\/p\u003e","brand":"Horiba","offers":[{"title":"500-NH3-IFS - Ammonia Electrode Filling Solution, 500 mL - 3200697173","offer_id":48226482553022,"sku":"3200697173","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CA-IFS - Calcium Electrode Filling Solution, 500 mL - 3200697177","offer_id":48226482585790,"sku":"3200697177","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-CL-IFS - Chloride Electrode Filling Solution, 500 mL - 3200697169","offer_id":48226482618558,"sku":"3200697169","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-F-IFS - Fluoride Electrode Filling Solution, 500 mL - 3200697165","offer_id":48226482651326,"sku":"3200697165","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-NO3-IFS - Nitrate Electrode Filling Solution, 500 mL - 3200697181","offer_id":48226482684094,"sku":"3200697181","price":92.0,"currency_code":"USD","in_stock":true},{"title":"500-K-IFS - Potassium Electrode Filling Solution, 500 mL - 3200697185","offer_id":48226482716862,"sku":"3200697185","price":92.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/envirotechonline.com\/products\/horiba-ion-selective-electrode-filling-solutions","provider":"EnviroTech Services","version":"1.0","type":"link"}