Low Tech 10g

[Red_Beard]

I do!
Pretty easy, 2ml tank water in the vial, dump in a spoonfull of reagent, (do not mix yet!) Fill the syringe to the 1.0ml mark and add that to the vail until the syringe reads .4ml then mix it for 10-20 seconds, it should be a pink color.

Now the titration starts, hold the vial in one hand and swish it while slooowly adding drops until the vial turns blue. Once blue, stop adding drops and look to see how much is left in the syringe and look that number up in the chart to see what the ppm ca is. Let me know if you have questions!

 

[Lasse]

I do!
Pretty easy, 2ml tank water in the vial, dump in a spoonfull of reagent, (do not mix yet!) Fill the syringe to the 1.0ml mark and add that to the vail until the syringe reads .4ml then mix it for 10-20 seconds, it should be a pink color.

Now the titration starts, hold the vial in one hand and swish it while slooowly adding drops until the vial turns blue. Once blue, stop adding drops and look to see how much is left in the syringe and look that number up in the chart to see what the ppm ca is. Let me know if you have questions!

I do exactly like this - only one remark - add the very small drops and very slow when you come near the expected value and swirl the sample around 5 sec before next addition - the colour change take up to 5 sec near the endpoint.

There is one other problem with salifert´s test - IMO. Even if it is an European brand - they answer in ppm instead for mg/L. When concentrations in saltwater is below 50 ppm of anything - it does not matter so much because the conversation factor att 35 PSU is 1.0233. 50 ppm becomes 51 mg/L but if you read 420 ppm as Ca - it means that this is equal with around 430 mg/L of Ca. If you read 1290 ppm Mg - its equal to around 1320 mg/L Mg.

Sincerely Lasse