Hanna HI718 (Iodine) Precipitating?

[Siberwulf]

Hey all,

I've just picked up the Hanna HI718 Test. I know my Iodine is way low, so I'm expecting some low readings before I dose it up. When I de the test, I saw a 0.0 which seemed..fishy.

After looking at the cuvette, it looks like the powder has precipitated to the bottom and I'm sure that's not right. I've shaken it a little more violently trying to get it to dissolve, but it totally isn't dissolving.

Has anyone had this issue and how did you overcome it?

 

[Randy Holmes-Farley]

Wrong test.

It does not detect the forms present in seawater.

There is no checker for seawater iodide and iodate.

 

[Siberwulf]

Wrong test.

It does not detect the forms present in seawater.

There is no checker for seawater iodide and iodate.

So Chemistry noobie here. Triton said I had low Iodine. (9.00 µg/l when I wanted 30 - 90µg/l). I picked up some Potassium Iodate to help boost it (maybe this was the wrong product if I'm trying to jump up Iodine).

I guess I'm still confused on Iodine vs Iodate. I thought I was testing Iodine because I had low Iodine. :-/

 

[Randy Holmes-Farley]

So Chemistry noobie here. Triton said I had low Iodine. (9.00 µg/l when I wanted 30 - 90µg/l). I picked up some Potassium Iodate to help boost it (maybe this was the wrong product if I'm trying to jump up Iodine).

I guess I'm still confused on Iodine vs Iodate. I thought I was testing Iodine because I had low Iodine. :-/

Iodine is the generic name for the iodine atom, I.

it can come in many forms.

The form tested by that checker is I2, used like chlorine (Cl2) to sterilize water in pools and spas:

Iodine Colorimeter – Checker® HC HI718

The HI718 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure iodine.

www.hannainst.com

"The HI718 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure iodine. Introduced as an alternative to chlorine, iodine as a sanitizer decreases eye irritation in pools and saps and provides a more stable level of disinfection in adverse conditions.

"

That is not the form present in seawater,

Iodide (I-) and iodate (IO3-) are the forms present in seawater.

This explains these issues in more detail:

Chemistry And The Aquarium: Iodine in Marine Aquaria: Part I

This first article will cover what is known about iodine in the oceans, including what forms it takes and how toxic these forms are, what organisms use it, how they obtain it, and what they use it for. It will also detail some issues around iodine measurement and what natural sources of iodine...

reefs.com

 

[Siberwulf]

Iodine is the generic name for the iodine atom, I.

it can come in many forms.

The form tested by that checker is I2, used like chlorine (Cl2) to sterilize water in pools and spas:

Iodine Colorimeter – Checker® HC HI718

The HI718 Checker®HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure iodine.

www.hannainst.com

"The HI718 Checker® HC (Handheld Colorimeter) provides a simple, accurate and cost effective way to measure iodine. Introduced as an alternative to chlorine, iodine as a sanitizer decreases eye irritation in pools and saps and provides a more stable level of disinfection in adverse conditions.

"

That is not the form present in seawater,

Iodide (I-) and iodate (IO3-) are the forms present in seawater.

This explains these issues in more detail:

Chemistry And The Aquarium: Iodine in Marine Aquaria: Part I

This first article will cover what is known about iodine in the oceans, including what forms it takes and how toxic these forms are, what organisms use it, how they obtain it, and what they use it for. It will also detail some issues around iodine measurement and what natural sources of iodine...

reefs.com

That helps!

So, dosing Iodide is risky at best, since there's no way to measure (and measure what you dose). Same goes for Iodine?

I don't have any pure herbivore fish, so it looks like the food I'm dropping in won't be the best source.

 

[Randy Holmes-Farley]

That helps!

So, dosing Iodide is risky at best, since there's no way to measure (and measure what you dose). Same goes for Iodine?

I don't have any pure herbivore fish, so it looks like the food I'm dropping in won't be the best source.

There are kits to measure it in seawater, and it often depletes fairly fast since algae and other organisms take it up. Lots of folks dose it. I did for years and stopped and did not see a difference, but many folks think it useful for their tanks.

 

[Siberwulf]

There are kits to measure it in seawater, and it often depletes fairly fast since algae and other organisms take it up. Lots of folks dose it. I did for years and stopped and did not see a difference, but many folks think it useful for their tanks.

Do you have one that you recommend over others?

 

[Randy Holmes-Farley]

Do you have one that you recommend over others?

I've not used one for a long time, but i thought the Salifert was OK.

 

[Siberwulf]

Ok! Update time!

I snagged the Salifert test. Ran it yesterday AM, no reading in both Iodide and Iodate/Iodine. I dosed 4ml of ESV B-Ionic Iodide (it says 1ml/20gal, and I didn't want to OD it). Tested again this morning and Iodide, Iodate and Iodine are still zero. I'm anxious to dose again, as it says to do that dosing weekly.

Am I missing something silly?

 

[Randy Holmes-Farley]

Ok! Update time!

I snagged the Salifert test. Ran it yesterday AM, no reading in both Iodide and Iodate/Iodine. I dosed 4ml of ESV B-Ionic Iodide (it says 1ml/20gal, and I didn't want to OD it). Tested again this morning and Iodide, Iodate and Iodine are still zero. I'm anxious to dose again, as it says to do that dosing weekly.

Am I missing something silly?

I would test 10-30 min after dosing to see if the kit detects what you dosed.

 

[Siberwulf]

I would test 10-30 min after dosing to see if the kit detects what you dosed.

I'll do that first thing Monday...just in case the kit isn't detecting it.