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| Biodegradable chelating agent : HIDS |
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High chelating capability:
HIDS effectively traps and inactivates heavy metal ions such as Fe3+ and Cu2+, as well as Ca2+ and Mg2+ over wide range of pH |
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High performance under various conditions:
HIDS shows superior performance as a chelating agent; high thermal stability, high solubility in concentrated alkaline solutions and low corrosion. |
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Environmental harmonious chelating agent:
HIDS is classified in one of the most biodegradable & safe material. |
| Structure |
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| Chemical name |
Tetrasodium 3-Hydroxy-2,2’-Iminodisuccinate |
| Chemical formulas |
C8H7NO9·4Na |
| Molecular weight |
353.1 |
| CAS No.1 |
190195-65-4 |
| Appearance |
Pale yellow~yellow, liquid |
| Form |
50wt% aqueous solution |
| pH |
10±1 (25ºC)
(HIDS solution is alkaline. Please refer to MSDS when handling) |
| Density |
1.40~1.60 (20ºC) |
| Specifications may be changed without notice. |
Prospective applications |
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- • Household and I&I cleaner
- -detergent
- -dishwashing agent
- • Textile processing
- • Bleach stabilization
- • Photography
- • Paper and pulp processing
- • Scale removal and prevention
- • Metal treatment working
- • Water treatment
- • Agriculture etc.
Please investigate legal regulations and industry standards for your applications by yourself.
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Ecological information |
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| Biodegradability |
Biodegradable |
(MITI test) (*1) |
| Fish toxicity |
LC50 >2,000 mg/L |
(Medaka (Oryzas latipes) 96 hr) (*1) |
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Toxicological Information |
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| Acute toxicity |
LD50(rat)>2,000mg/L(*1) |
| Local effects |
·Primary skin irritation(rabbit)
Not irritating
( PII=0.4 (45 wt%), PII=0 (35 wt%) ,PII=0 (10 wt%) , PII=0 (89 wt%,powder)) (*1)
·Primary eye irrtation (rabbit)
Not irritating(*1)
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| Sensitization |
No skin sensitization (Maximization Test) (*1) |
| Mutagenicity(AMES text) |
Negative (*1) |
(*1)These data were obtained by a certified laboratory.
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Regulatory information |
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| ENCS |
(2)-3803 |
| TSCA Inventory |
Filed |
| ELINCS |
Not listed |
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Handling and Storage |
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- Wear appropriate protective equipments. Avoid contact with eyes, skin and clothing.
- HIDS solution is alkaline. It generates heat when mixed with strong acids.
- Avoid direct sunlight and keep closed tightly for storage.
- Avoid iron, copper and galvanized steel bottles. Use stainless steel or plastic bottles for storage.
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Protective equipments |
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| Eye protection |
Face shields or safety goggles |
| Hand protection |
Wear rubber gloves. |
| Skin and Body protection |
When contact is likely, rubber gloves and rubber boots. |
Data are extracted from Material Safety Data Sheet (MSDS, QSJ-5174-00-02).
MSDS (QSJ-5174-00-02) is available on request.
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Patents |
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US 6063302
'Method for handling iminocalboxylic acid salt' (NIPPON SHOKUBAI CO., LTD.) |
HIDS Properties |
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| • Acid dissociation constants and stability constants |
| Acid dissociation constants |
pKa1: 2.83
pKa2: 3.56
pKa3: 5.15
pKa4: 9.11 |
| Complex Stability constants |
pKaCa2+: 4.8
pKaFe3+: 12.5 |
| C.V. value |
300 mg CaCO3/g |
| • Fe3+chelating capability |
HIDS forms water-soluble complexes with various kinds of metal ions over a wide range of pH. In particular, it shows superior performance in chelating Fe3+ ion in alkaline solution.
| Test solution |
HIDS (or EDTA): 0.01M
Fe3+: 0.01M |
| Temperature |
Room temperature |
| Experimental procedure |
The test solution was allowed to stand at room temperature for one week. The solution was then filtered to separate the sediment (hydrated Fe compounds), and Fe3+ concentration in the filtrate was determined by inductively coupled plasma (ICP). |
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(*)Residual Fe3+: Ratio of the Fe3+ dispersing in the solution after the test to the initial Fe3+ |
| • Thermal stability and pH stability |
HIDS shows high stability in harsh conditions. HIDS is stable at high temperature and at a range of pH 4-13.
| Condition |
HIDS : 10%
Temperature : 80ºC |
| Experimental procedure |
The test solution was incubated at 80°C, and aliquots were sampled at the indicated hours. The residual HIDS amount was measured using high-performance liquid chromatography (HPLC). |
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| • Solubility in alkaline solution |
HIDS is highly soluble in aqueous alkaline solutions. Therefore, HIDS can be added into concentrated alkaline solutions without solubilizing agents.
| Measurement temperature |
0ºC |
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| • Solubilization of water-insoluble calcium salt |
HIDS is able to solubilize water-insoluble calcium salt, which is the main component of scales. HIDS effectively removes scales in tanks and tubes, and prevents scale generation.
| Test solution |
Water-insoluble calcium salt: 0.6%
Chelating agent: 0.2%
NaOH: 3%
Temperature: 80ºC |
| Experimental procedure |
The test solution was stirred at 80ºC for one hour, and the concentration of dissolved Ca2+ was measured |
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(*)Calcium salt solubilization ability: Ratio of the dissolved Ca salt to the initially added calcium salt. |
HIDS is less corrosive to glasses compared with other chelating agents.
| Test solution |
NaOH: 10%
Chelating agent: 3%
Test piece: Slide glass
Temperature: 100ºC |
| Experimental procedure |
The test pieces were placed in the test solution for three days at 100ºC. Those pieces were weighed after washing, and the corrosion degree was calculated from the weight change. |
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Instruction |
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- The information contained in this publication is provided free of change and is based on technical data that NIPPON SHOKUBAI believes to be reliable.
- We make no warranties, expressed or implied, and assume no liability in connection with any of this information as the conditions of use are outside of our control. It is intended for use by persons having technical skill and at their own discretion and risk.
- None of the contents of this publication should be taken as a license to operate under, or a recommendation to infringe, patents.
NIPPON SHOKUBAI CO., LTD.
Fine & Performance Chemicals Business
Fine & Speciality Chemicals Sales & Marketing Group
Hibiya-Dai Bldg., 1-2-2, Uchisaiwaicho, Chiyoda-ku,
Tokyo 100-0011 , Japan.
TEL +81-3-3506-7561
FAX +81-3-3506-7597
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